Pot Shots: Breaking Dormancy

 

These tiny Alocasias grow from tubers stored in the basement over winter. Could they be A. ‘Stingray?

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It was with a fair amount of faith and a tad of skepticism that I pulled up some of my Colocasias and Alocasias last fall and stored them in the basement in paper grocery bags for the winter.  Some had been growing in the ground, and others in pots that I wanted to reuse with other plants, for winter.

All were likely to die if frost hit them.  So I did the best I could to save them.

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How many plants? I didn’t count…. But here are four grocery bags filled with Aroids to sleep through winter in the basement.

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 Some of the Colocasias, like C. ‘Pink China’ are reliably hardy in our climate.  I just leave them be when frost comes, knowing, now, that I can count on their return the following summer.

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Colocasia ‘Pink China’ return each summer here in Zone 7.

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But most are native in Zones 8, 9, 10 or 11 and so must be moved indoors before the first frost.  I searched online for advice on how to overwinter these very tender perennials.  Surprisingly, a number of writers suggested simply pulling the entire plant up, roots and soil still intact, and putting the entire root ball in a paper bag, to be stored in a basement or partially heated garage.

I found the two largest Alocasias in little pots at Trader Joes, in February of 2017 By October they had grown huge.  Each went into its own Trader Joe’s paper bag for the trip to our basement.

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This Alocasia, originally from Trader Joe’s, wasn’t labeled when I bought it last winter. It reminds me of A. ‘Regal Shields,’ but grows a bit larger.  I pulled the entire root ball from the pot, and stored it in the basement over winter.

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I am happy to report that both of them made it through winter stored in the rough, and have begun to show new growth.  I didn’t water them at all from November until moving them back outside in early May.   I potted them into plastic nursery pots, watered them well and set them aside to see whether they would live.  And now I am thrilled to see evidence of new growth on both plants.

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It’s alive!

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Aroids grow from tubers, and so can go completely dormant for some part of each year.  The size and shape of the tuber differs between the Caladium, Colocasia, Alocasia and Zantedeschia.  But all of these plants may be completely dried out and stored for some months, and then re-animated when good conditions for their growth return.

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From left: Caladium Burning Heart,’ Alocasia, and Zantedesichia ‘Memories’

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I have experimented with various ways of storing all of these tubers.  There is a balance to maintain; dormant tubers may rot if kept wet and cool.  I brought one of my Alocasias into the living room over winter.  It remained in active growth indoors, and I just moved it back outside in early June.

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This Alocasia ‘plumbea’ spent the winter indoors, with us and the cat.  It is large enough to need some support.  C. ‘Moonlight’ overwintered in the same pot.

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The Caladiums planted in the same pot went dormant over the winter, but are now in active growth again outside.  I watered this plant every week or so and gave it warmth and light.

A third Alocasia went into a dark spot in the garage.  I only watered it once or twice during its storage time, and it kept its leaves the entire winter.  When I moved it back outside, it didn’t miss a beat and immediately began sprouting new leaves.

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Colocasia ‘Black Magic’ came into the garage, dormant, with its Begonia companion. This plant has overwintered outside in 2015 and 2016.  I dug this one up and grew it on in the pot last summer.  I’ve already transplanted two starts from this pot to other spots in the garden.

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I moved six pots of Colocasias into the basement, near a window, and watered them occasionally.    Their leaves died back gradually, but many had begun to sprout new ones before I brought the pots back outside last month.  All are back in active growth once again.

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Colocasia ‘Coffee Cups’ spent winter in the rough in the basement.

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Of all the storage methods, I prefer keeping the plants in the house at normal room temperature and in growth.  But there is only so much room available for these very large plants.

Bringing the largest pots into the house is impractical.  The most radical method, paper bag dry storage, also requires the most recovery time for the plant to send up new growth again.  But it works to keep the plant alive.  I kept the root balls intact over winter.  If I do this again, I may try drying out the Colocasia or Alocasia tuber and storing it dry,  just as I do for the Caladiums and Zantedeschias.

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Colocasia ‘Mojito’ remained in its pot in the basement, keeping some of its leaves until early spring.  A Zantedeschia shares the pot.

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Of course, the wild card with all of these methods is the timing.  When do you replant and reanimate the tubers?

I started our stored Caladiums in March, but with a cool spring, had to hold them indoors for several weeks longer than I would like.   I started the Zantedeschias at about the same time, but they aren’t as tender and could go back outside much earlier.  Many of our Zantedeschias stay outside in the garden year round, growing larger and lusher each year.

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Zantedeschia ‘Memories’ came in the mail as a tuber in early April.

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I bought a dormant Alocasia tuber this spring, potted it indoors, and am happy to show you that it is growing beautifully and bulking up.  It was completely dry, rootless, and fit in the palm of my hand in March.

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Alocasia grown from a tuber from The Great Big Greenhouse in Richmond … I just don’t remember the cultivar name…

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Colocasia ‘Black Coral’  came to the garden as a tiny tissue culture plant from Brent and Becky’s Bulbs.  Every new leaf grows on a longer petiole than the one before.

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Once they are outside in the heat, tropical Aroids grow very quickly.  C. ‘Black Coral’ is rated hardy in Zone 7, so I could probably rely on it surviving our winter outdoors.

The Alocasias that haven’t yet reappeared are the ‘Stingray.’  I am still waiting for them to emerge. . . or for me to identify them again from the still emerging Aroids.

And we will happily welcome them to the summer garden once they finally turn up.

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Alocasia ‘Stingray’ thrive in heat and humidity. These tropical plants help filter the air and trap carbon with their huge leaves.  Here in September 2017

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Woodland Gnome 2018
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C. ‘Black Magic’ was transplanted yesterday into its summer pot with Sedum ‘Angelina’.

 

 

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Growing Herbs for the Beauty of It

Culinary tri-color sage grows alongside perennial Geranium and fennel.

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I grow herbs mostly for their beauty.  That, and their toughness as season-long dependable plants in our pots, beds and baskets.

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Rose scented Pelargonium grows near emerging Colocasia.

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I haven’t built them their own little parterre, and I don’t grow them in cute little matching terra cotta pots, either.  I treat them like any other plant and let them earn their spot in my heart and in our garden.

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A newly planted Spanish lavender will soon fill this pot.  It is surrounded with wild violets and wild strawberries.

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Herbs may be some of the oldest plants cultivated and passed on generation to generation and from one culture to the next.  They are celebrated in story and song.  They can heal us, feed us, soothe us and delight us.  Herbs are intensely fragrant; a living, growing perfume.

But I would grow them even without their rich mythological and pharmacological mystique.  Why?  Because I can depend on them.

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The first fennel flowers of the season opend this week.

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The strong fragrance and coarse texture of many herbs makes them distasteful to the deer I want to foil.  I learned in the early years of this garden that I could plant herbs in the spring, and expect them to still be merrily growing in our garden, sans critter damage, the following October.  I like to believe that planting lots of fragrant herbs can also protect more desirable plants growing nearby.

They are a good investment.  They bring me peace of mind.

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Basil

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But the more I tried different cultivars of favorite herbs, the more I delighted in them for their own sake.  They are entertaining plants to grow.  Let me explain.

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Chocolate mint

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Most herbs draw in pollinators.  That means that on a sunny day, I’ll find bees, wasps, butterflies, and all sorts of bright little insects that I can’t name without a field guide hovering around them and blissing out on their sweet nectar.

As I observe and photograph the visitors, I can crush and sniff their wonderfully fragrant leaves.

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Black Swallowtail butterfly and caterpillars on fennel, August 2017

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Many herbs, like the mints and scented geraniums, produce compounds in their leaves that repel biting insects.

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Mountain mint, Pycnanthemum muticum, is a versatile herb with strongly fragrant leaves.  The Garden Club of America  has named it their 2018 native plant of the year.

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If a buzzy or bitey is getting too up close and personal with me, I can pinch a stem and rub the fragrant leaves on whatever skin might be exposed.

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Pineapple mint with lavender

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Mountain mint, though not so beautiful, is an especially effective insect repellent with no toxicity to harm my family or me.

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Rose scented ‘Skeleton Rose’ Pelargonium repels insects with its fragrance. Growing here in a basket with Lantana, this basket makes a tough combination for full sun.

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That same fragrance makes herbs appealing as cut flowers, too.  Stems worked in with other flowers make interesting, long lasting arrangements.

My favorite herbs for the vase are Basil, Pelargoniums, Artemesia, and Salvias. The interesting colors, shapes and textures of herbal foliage pumps up any vase.  Oftentimes, a stem will root in the vase and can be planted out to grow on when the arrangement is disassembled.

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Basil with pineapple mint, Lime Queen Zinnia and roses.

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Just as herbs create interesting contrasts with flowers in a vase, so they also pump up pots, baskets and perennial beds.

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White Monarda came to our garden as a gift from a gardening friend.  It is edible, can be used for tea, and looks lovely in a vase.  Also known as bee balm or Oswego tea, this plant is a useful North American native herb.

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Although herbs bloom, most have relatively small and insignificant flowers.  With a few exceptions, like some basils, dill, borage and fennel; herbs are grown more for their leaves than for their flowers.

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Now rosemary is a delight all unto itself.  Sometimes evergreen if the winter is mild, usually perennial, it delights us with its blue, winter flowers.

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Rosemary in bloom

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Rosemary often comes into bloom in late autumn, and many years I can include blooming sprigs of rosemary in our holiday wreathes in December.

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A newly planted rosemary ‘Tuscan Blue’ will triple in size by fall. Sedum ‘Angelina’ shares the pot.

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The pungent fragrance of rosemary exudes from a lovely little shrubby plant.  With rosemary, as with other Mediterranean herbs, the hotter the better in summer.  Growing to 4′ tall or more, a rosemary hedge by a fence or wall is possible in Zones 7b or 8 and warmer.

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An upright shrubby rosemary grows here with prostrate, creeping  rosemary.  Most of our rosemary plants died in our cold winter, and so I’ve had to replace them with new this spring.

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Many people grow herbs primarily for use in the kitchen.  And most, but not all, are edible.  Herbs generally respond well to the continual pruning that frequent use entails.

There are whole encyclopedias of information on using herbs for cooking, crafts, healing and housewifery.  I’ll leave you to read them if you want to learn more.

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Creeping Rosemary makes a good groundcover, or a good ‘spiller’ in a pot in full sun.

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I get busy and forget to cut and use them, I’ll admit to you.  My plants might be bushier if I used them more.

But I love watching my Pelargoniums grow huge and fill the gigantic pots I grow them in.  I love watching butterfly larvae growing plump as they harvest my parsley and fennel for me.  And yes, quite often the plants regenerate themselves within a few weeks once the larvae crawl off for their transformative naps.

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And so it is that I end up growing herbs much like any other garden plant; no special fuss required.

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Comphrey with Artemesia

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That said, keep in mind that herbs such as lavenders, culinary sages, thymes, rosemaries, oregano, germanders, Artemesias, Santolinas, and a few others originated in hot, mountainous areas where the soil may be a bit rocky and the rain scarce.  They aren’t used to coddling, and they don’t much appreciate our muggy damp summers in Virginia.

Our soil may be a bit too acidic and heavy with clay.  Our nights too damp and warm, our rain too intense.  There may be some rot or mildew.  Their roots may not thrive.

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There are a few simple things to do to make these Mediterranean herbs a bit more comfortable.  I tend to grow many of them in pots more successfully than in our heavy clay soil.

But culture in the soil is possible.  I like to dig some dolomitic lime and a little pea gravel into the planting hole before I plant a new transplant.  I set the crown a little high, mounding up the back-fill around the top-most roots, but not up the stem.  Then, I mulch with gravel out a few inches around the plant.  I’m told that chicken grit or broken up oyster shells work well for mulching herbs, too.

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Roots of these Mediterranean herbs want good drainage.  They can rot easily if left sitting in wet soil for very long.  That is why it is smart to amend the soil and plant them high.  If your soil is too heavy with clay, also dig in some compost before you plant, to loosen and improve it a bit.

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If planting in a pot, I mix some lime into the top few inches of the potting soil, set the plants a little high, and mulch the pot with pea gravel.

The gravel reflects sun and heat up into the plant on fine days, holds a little extra moisture during drought, and prevents soil from splashing up onto the lower leaves when it rains.  The gravel mulch helps protect those lower leaves from any disease harbored in the wet soil.

When growing an herb plant with woody stems or grey to blue leaves, take these precautions if your soil and weather is like ours.

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Artemesia with lavender and Iris

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Basil, dill and cilantro are annuals.  Parsley a biennial.  Chives and other Alliums are perennials, even when they are harvested annually for their bulbs.   All are soft stemmed and want a bit gentler treatment.  They appreciate more water and richer soil… but not too rich.  Herbs grown without much fertilizer have better flavor and aroma and grow more compactly.

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The Alliums are just beginning to bloom.

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Grow all of these in full sun, or the most sun you can manage.  The more sun, the more growth in most cases.

Also, give them space to grow.  Your little transplant fresh from its 4″ pot may look a bit small, and your new planting a bit sparse at first.  But please remember that most herbs grow quickly.  Mind the mature height and spread and allow space for your herbs to grow into their potential.

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Pineapple sage in its fall glory, still sending out new buds in late September 2017.

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Crowding, in our weather, makes it more likely for mold or rot to get a start where the branches stay too wet, and where air can’t easily circulate around their leaves.

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Thyme needs a good trim now and again. The stems get too long, with new growth only towards the tips.

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I wait each spring to see which of our perennial herbs made it through the winter, and which were finished off by the cold and damp soil.  Ironically, most will make it through until early spring.  It is those last few weeks and those last few frosts that may prove too much.

That is why I wait until I see new growth sprouting from their branches, before I cut them back.  Once they are growing and the weather is milder, I can cut with confidence.  Cut too soon, and a late freeze may be too much of a shock.  I killed a beautiful Agastache this spring by pruning it too early.

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Breakfast at the Agastache… summer 2017.

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Cut back any obviously dead wood, and trim most of the branches by at least a third to stimulate new, healthy growth.  But don’t throw all of those trimming away!  Many herbs, like Artemesia will root from these stem cuttings taken in late winter or early spring.  What will you lose by trying? 

And there is nothing complicated in my technique.  I open up a hole in the earth with my blade, insert a stem a few inches deep, and close the hole.  It roots and begins growing within a few weeks.  That is how I’ve spread Artemesia all around my garden over the years.

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Pineapple sage has beautiful leaves, but won’t bloom until late September.  It is hardy in our garden.

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Most herbs will root from stem cuttings.  You might cut several stems of basil, use most of the leaves, and root the stems in a glass of water to generate new plants over the summer.  Herbs like thyme are easy to divide.  Just take a stem on the outside of the plant, with some roots already growing, cut it off and plant it where its needed.  Do this with most Salvias, too.

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Apple mint roots easily in water. But easier still, pull a stem with some roots attached and planted it up elsewhere.

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If you’ve shied away from planting herbs in the past, I hope you’ll try a few this year.  You don’t need to be an expert gardener to succeed.  Most are very easy, and forgiving.

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An heirloom Pelargonium that I managed to root from a gifted stem cutting is now out in a basket for the summer.  This cultivar was brought to Williamsburg by the early colonists and grown here in the Colonial era.

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And this is the perfect time to begin, now that we are into the second week of June.  Garden centers in our area have just begun to mark down their herbs by 20-30%.  There are great bargains available this month as plant shops clear out their stock.

Unlike more tender plants, herbs will establish just fine in summer’s heat, so long as you don’t let them completely dry out as they grow new roots into the surrounding soil.

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Deadhead lavender, and other herbs, to keep the flowers coming all season. This is Spanish lavender, with its ‘rabbit ears’ atop the flower.

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There is always more to learn, there is always more to try, and there are always more beautiful and interesting plants to introduce in our gardens.

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Woodland Gnome 2018
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Rooting Caladium Leaves

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“Oops!  I didn’t mean to do that!”

Sometimes when I am transplanting a Caladium, a leaf will break off in the process.  No matter how careful I’m trying to be with moving the plant from where it has been growing to where it will be growing, a piece will sometimes break away.

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And with such a lovely leaf, why would anyone simply throw it away?  And that is how I discovered a little discussed secret about Caladiums. 

A green-handed gardening friend had a rooted Caladium leaf on her kitchen windowsill when I visited with her last summer, and I learned that it is possible to root a Caladium leaf from her.

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A Caladium leaf grows on a petiole that is connected, below ground, to the Caladium’s tuber.  The tuber is a fleshy storage organ which helps the plant survive while it is dormant, without active leaves or roots.

It is from the tuber that new roots and stems emerge when there is sufficient warmth and moisture to support growth.  New leaves emerge from the tuber at a growth point called a ‘bud,’ which is rich in growth hormones.

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Late October 2017, tubers were still in active growth when I dug them up to store over winter.  Tubers tend to grow in segments.  Larger tubers may be broken apart into smaller sections, especially when digging them in the fall.  This is another way to propagate more plants.

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When a Caladium leaf, and its petiole, break off with a bit of the brown tuber still attached, there is potential for this ‘division’ to grow new roots.

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These leaves have been rooting for only a few days. On a rainy humid day like today, there is a good chance that these rooted leaves will establish quickly in a pot in a shady spot.

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Once the roots form, the leaf is likely to survive.  The leaf has to be able to absorb enough water to prevent it from wilting, as water evaporates from its surface.   A new tuber begins to grow at the point where the roots are growing from the petiole.

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Once this new tuber is actively growing, new leaves will begin to emerge.  The more leaves in active growth, the more photosynthesis will occur.  The sugars produced during photosynthesis will be sent to the new tuber for storage.

Depending on how many weeks the new plant can grow before it goes back into dormancy, the tuber may bulk up enough to survive until spring.  If it doesn’t, you will still have enjoyed the rooted Caladium leaf for that season.

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I transplanted the newly rooted leaf into this shady spot on the deck where it can continue growth. If it needs more space in a few weeks, it will be easy enough to transplant it to a pot of its own.

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One must be careful about respecting plant patents in any home-grown propagation efforts.  That said, I have been carefully saving any leaves that break away while I am transplanting Caladiums this spring, and placing them in clean bottles filled with fresh water.

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Small bottles tend to work well, and I change out the water every few days to minimize any bacterial growth that would stop the process before the leaf can grow new roots.

Keep this technique in mind if you are designing pots or making floral arrangements and don’t have room for a fully established Caladium plant.  Maybe you do have room for a rooted leaf to make your arrangement sparkle with that special flair a Caladium leaf always brings.

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 September 2017, a successfully rooted leaf grows on. I hope it will emerge again this spring.

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I successfully established this rooted leaf last summer, and stored its tiny tuber in its pot over winter.  I’m still waiting to see whether it survived, and will leaf out again this year.

“Fingers crossed…”

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Woodland Gnome 2018

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Green Thumb Tip #17: Give Them Time

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We are just finishing a harsh winter, and find ourselves in the midst of a chilly, slow spring.  Most of our woodies and perennials are a little behind the times in showing new growth, according to our experience with them in recent years.  Understandable!

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The Camellias didn’t do well in our cold, windy winter weather.

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We had a few nights in January when the lows dipped a little below 0 degrees F, which is rare here.  We had winter temperatures more like Zone 6, found several hundred miles to the west.  Our woodies and perennials rated for Zones 7 or 8 suffered from the deep, prolonged cold.  And it shows.

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Normally evergreen shrubs, now show extensive leaf damage, with brown and curling leaves.  Bark on some trunks and branches split and some stand now with bare branches.   Those woody shrubs that can easily withstand winter in Zones 6a or colder generally look OK.  But those that normally grow to our south, that we coddle along here in the edge or warmer climates, took a hit.

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I needed to cut back far more dead wood from our roses than any year in memory.  It is a very sad sight to see established shrubs looking so bad here in the second week of April.  Our cool temperatures through March and early April, with a little snow recently, have slowed the whole process of new spring growth, too.

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Some gardeners may be struggling with a decision about whether to replace these badly damaged plants.  Now that the garden centers are finally allowing deliveries of fresh stock, it is certainly tempting to rip out the shabby and re-plant with a vigorous plant covered in fresh growth.

I will counsel patience, which is the advice I am also giving to myself this week!  We invest in woodies and perennials mainly because they are able to survive harsh winters.  While leaves and some branches may be lost, there is still life in the wood and in the roots.

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I was out doing the ‘scratch test’ on a completely bare lilac shrub this morning.  Its condition is still a troubling mystery to us, as several other lilacs, of the same cultivar, are leafing out and are covered in budding flowers.  But this one, on the end of the row, sits completely bare without a swelling bud to be seen.  I scratched a little with my fingernail one of the major branches, and found green just below its thin bark.  So long as there is green, there is life.

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This lilac survived our winter in a pot near the kitchen door. We are delighted to see it in bloom so early. I’ll plant this shrub out in the garden once the blooms are finished. It has been in this pot for several years, after arriving as a bare root twig in the mail in early 2015.

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I want to prune this one back pretty severely, mostly because it is becoming an eyesore.  But my Master Gardener friend strongly advises to give it more time.  She suggests waiting until early June to make life and death decisions on trees and shrubs, to give them time to recover.

I may prune the lilac a little, now that the freezing weather here is likely over for the year, and hope that stimulates some fresh growth.

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Japanese Maples have finally allowed their leaves to unfold this week.

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That is what we’ve done with the roses.  We pruned, hard, and we see new shoots coming from the roots on all of our roses now.

There are a few good reasons to nurse our winter damaged woodies back to health instead of replacing them now.  First, our tree or shrub is established and has a developed root system.  Even if all of its trunks and stems are dead, new ones will soon appear from the roots.  This seems to happen every single year with my Ficus afghanistanica ‘Silver Lyre’.  It keeps the shrub a manageable size, and the plant looks pretty good again by early summer.

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F. ‘Silver Lyre’s’ stems are visible beside the Iris leaves. Rated to Zone 7b, it always returns, sometime in May, from its roots.  A Sweetbay Magnolia waits behind it, in a nursery pot.  I want to see some sign of life before planting it.

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Another reason to rejuvenate an established shrub, rather than plant a new one, is economic.  Finding a good sized shrub to replace the old one is a bit of an investment.  Weather and higher fuel prices are definitely reflected in shrub prices this spring.  I’ve felt a little bit of ‘sticker shock’ when looking at prices at area nurseries.

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These Viburnums show cold damage, even while still at a local nursery.

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And even if you buy a new shrub, it is likely to sustain damage during its adjustment time, if you live in deer country.  Shrubs fresh from the grower have been heavily fertilized to induce quick growth.  This extra nitrogen in the plant’s tissue tastes a little ‘salty’ to grazing deer, and makes the shrub that much more delicious and attractive to them.  It takes a year or so of growth before the tastiness of new shrubs seems to decline, and they are ignored by grazing deer.

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I’ve just watched a major investment in new holly trees get nibbled down nearly to the branches by deer in our area.  It is very discouraging, especially if your new shrub is replacing one damaged by winter’s weather!

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This Eucalyptus sometimes sprouts new leaves from its existing trunks in spring. Last winter it was killed back to its roots, but then grew about 6′ during the season.  I expect it to send up new growth from its roots by early May.

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All things considered, I am planning to give our woodies another six to eight weeks, and every possible chance, before declaring them and cutting them out.  It is the humane and sensible approach.  Even though the selection at garden centers this month is tempting, I will wait.

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The view this week at the top of our garden. Still looks rather wintery, doesn’t it?  The southern wax myrtles which normally screen our view, were hit hard by the cold, and a new flush of leaves have not yet opened.

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In this climate, it is generally better to plant in fall, anyway.  Fall planted shrubs get a good start in cooler weather, so their roots can grow and establish the plant in the surrounding soil before summer’s heat sets in.  The selection may be a little more sparse by October or November, but the prices are often better, as nurseries try to clear their stock before winter.

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This English holly, purchased last November, lived in a container over winter, and may be too far gone to save. I planted it out in the garden last month in hope it may recover….

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And of course, you might try propagating replacement shrubs yourself, from cuttings.  I have pretty good luck rooting hardwood cuttings over winter, or greenwood cuttings in spring and summer.  It isn’t hard to do, if you are willing to wait a few years for the shrub to grow to maturity.

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As with so many thing in the garden, it takes time and patience to achieve our goals.  They say that ‘time heals all things.’

That may not be true 100% of the time, but patience allows us to achieve many things that others may believe impossible!

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Our red buckeye tree was knocked back to the ground in a summer 2013 storm.  It lived and has grown to about 5′ high in the years since.

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Woodland Gnome 2018

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“Green Thumb” Tips: 

Many visitors to Forest Garden are amazing gardeners with years of experience to share.  Others are just getting started, and are looking for a few ‘tips and tricks’ to help grow the garden of their dreams.

I believe the only difference between a “Green Thumb” and a “Brown Thumb” is a little bit of know-how and a lot of passion for our plants.

If you feel inclined to share a little bit of what you know from your years of gardening experience, please create a new post titled: “Green Thumb” Tip: (topic) and include a link back to this page.  I’ll update this page with a clear link back to your post in a listing by topic, so others can find your post, and will include the link in all future “Green Thumb” Tip posts.

Let’s work together to build an online resource of helpful tips for all of those who are passionate about gardens and gardening.
Green Thumb Tip # 13: Breaching Your Zone
Green Thumb Tip # 14: Right Place Right Plant
Green Thumb Tip # 15: Conquer the Weeds!
Green Thumb Tip #16: Diversify!
‘Green Thumb’ Tip:  Release Those Pot-Bound Roots! from Peggy, of Oak Trees Studios

 

 

Houseplant Hacks: Schlumbergera Propagation

Shlumbergera blooming  in our living room in February 2015.

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Christmas or Thanksgiving cactus plants may become another family heirloom.  Long lived and easy to care for, this is a quintessential ‘pass along plant’  you may be gifted with during the holidays.

Whether someone gives you one in full bloom in a little foil wrapped pot, or a well-meaning aunt insists on sending a cutting home with you, this is the season when many families enjoy a blooming cactus as a part of their holiday.

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A neighbor gave us this beautiful Christmas cactus covered in buds, last week.

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I can’t remember a time when my own mother didn’t have a Christmas cactus.  Her first one began as a gifted cutting from someone in the extended family.  At one time it had grown to a monstrous size, maybe 20″ or more around in a  large clay pot.  I never gave this ugly duckling house plant much consideration in those years, probably because hers didn’t often bloom.

Once you’ve enjoyed the vivid, decidedly odd blooms of a Schlumbergera on a wintery day, you may develop an appetite for these unusual plants just as I have.  Their extravagant flowers are meant to attract hummingbirds to pollinate them.  I love to have one in full bloom indoors when its snowing outside.

The ‘off’ bloom schedule of these beautiful tropical cacti may have something to do with their country and hemisphere of origin.  They were originally collected from the mountainous coastal forests of southeastern Brazil, where they grow in bright, humid shade.  They may be found growing high up in trees on moss covered branches, or in small pockets of soil in rocky areas at high altitudes.

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They were in cultivation in Europe by the early 19th Century, where breeders developed new cultivars for the market.  They were enjoyed both in homes and in fashionable heated greenhouses.

Although a cactus, these plants have no spines to stick you.   A succulent, they don’t require a great deal of care.  They offer a bulky green presence year round, bursting into abundant vivid bloom  between late October and late February each year.

Schlumbergera commonly turn up in grocery stores and garden centers blooming in shades of red, pink and purple.  Sometimes you may find one with white blooms touched with vivid rose.  More rarely, they can be found blooming  in shades of salmon, yellow or orange.

This is one reason it pays to know how to root a Christmas cactus.  Once you find one of the rarer colors, you might want to produce more to share, or for your own collection.

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Light pink Christmas cactus with a tiny white poinsettia on offer at a local garden center.

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Another reason is that the stems, which look like flat leaves, can sometimes be a bit fragile.  A section may break off while you are moving the plant or while you are moving around the plant.  When this happens, it feels nicer to root the broken piece than to discard it.

I’ve tried many different ways to root these odd green stems over the years.  The stems don’t really like to sit in water, though I’ve seen my mother root them this way.  They also don’t root reliably when simply stuck into some potting soil, though this sometimes works OK.  If the stars don’t align, or the temperature and humidity aren’t just right, then your efforts may be rewarded with a shriveled or mushy bit of stem with no roots to sustain it.

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I experimented with a new technique for rooting a Christmas cactus stem in extremely shallow water, on moist rocks.

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I was understandably excited when I saw a pin on Pinterest a few months ago, offering a novel way to root Schlumbergera.  The key to the wet rock method is to understand that Schlumbergera  naturally grow in a humid, coastal forest, high up in the mountains.  High humidity is the key, along with keeping the stem mostly dry, with only the growing tip in water.

Begin with a glass or small jar, and add a few inches of clean, attractive rocks.  Fill your glass with just enough fresh, cool water, to barely cover most of the rocks.  Then add your cuttings so that they rest on the rocks in very shallow water.  It works best to ‘twist’ the cutting from the parent plant rather than using scissors to remove it.

You will need at least 1 full stem section, though you may take a cutting a few inches long, like this one.  If the cutting already has flower buds, they will continue to grow as your cutting roots.

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Place your container and cuttings into a bright, cool window sill, where the cuttings will get bright light, but minimal direct sunlight.  Keep the water replenished every few days, and watch for those roots to grow.

Once the roots are at least 1/4″ long, you can pot up your rooted cutting in a peat based soil mix with a little grit.  The soil needs to drain easily.  Keep the soil just moist, but never really wet and never bone dry.

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This cutting is ready to pot up in good quality peat based potting mix.  Add a little fine grit to improve drainage.  If you plant into a container without drainage holes, be sure to begin with a few inches of gravel in the bottom of the container for drainage.

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I  feed my Christmas cactus monthly, during their season of bloom, with diluted orchid fertilizer; which keeps the buds coming.  Mine live near a large window where they get bright light during the daytime, but they also get natural darkness in late afternoon.  They like long nights and shorter days during their season of bloom.  The long nights help trigger bud formation. Shlumbergera also use more water when they are blooming, and of course thrive in a humid environment.

If your home has very dry air in winter, then try grouping them together, and consider setting the pots on trays of pebbles with a bit of standing water in the tray.

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This cutting rooted in the glass on moist rocks. After a few weeks, I planted it in its own little container to grow on until spring.

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In our climate, Christmas cactus thrive in bright shade on the deck all summer long.  I move them out in late April, once danger of frost has passed.  They love our humidity and grow lush with very little attention until time to bring them in ahead of the first fall frosts in late October.  By then, they have covered themselves in flower buds.

Keep your plants large and lush by adding rooted cuttings to your established pots of Christmas cactus.  They like a tight fit for their roots in the pot, but do pot them up every few years and give them some fresh, fertile soil.

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If your space allows, plant Christmas cactus in hanging planters, or set the pots up on plant stands where their drooping branches and long, pendulous flowers may be admired.   I’ve even seen a grouping of Christmas cactus pots arranged on a plant stand with layers of shelves, to give the illusion of a blooming Christmas tree.

These odd houseplants are extremely easy and rewarding to grow, once you know a few hacks to make your efforts more successful.

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Woodland Gnome 2017
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Green Thumb Tip #13: Breaching Your Zone

It is time to save our favorite Alocasia before our first freeze of the season, tonight.

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We expect frost tonight, the first of the season.   In fact, the forecast suggests that we may have temperatures in the 20s overnight; the result of an approaching cold front and gusty winds from the north all day.

We can’t complain.  Here in Zone 7, we know that frost is possible any time from October 15 on.  We’ve escaped the inevitable for nearly an extra month, and tonight is the night.

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Alocosia ‘Stingray’ in August, with Begonia ‘Griffin’ behind.  Both came inside today for the winter.

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Bringing tender plants in for winter remains one of our annual rituals here in our forest garden.   We procrastinate as long as possible, to give the plants every day possible out in the air and sunshine.   We’ve found that even tender tropicals will survive a few nights in the 40s better than a few days in the garage, and so have learned to wait until we are sure that we have a freeze warning before we gather them back indoors.  Moving them back and forth several times over our long fall really isn’t practical; we wait for the last possible moment to commit.

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Colocasia ‘Mohito’ is marginally hardy in our area. I couldn’t lift this pot, but brought all of the divisions of the plant indoors today.

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Preparations for the ‘great migration’ included doing a little homework to refresh my memory about the lowest temperatures some of our plants can tolerate, before they turn to mush.  Nearly all of our Begonias won’t tolerate any freezing at all.  The hardy ones are mostly dormant, already.

But the Aroids, the Alocasias and Colocasias, have different degrees of cold tolerance.  Unlike Caladiums, which like to stay cozy at 50F or above, some Colocasias remain hardy to Zone 6.

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Colocasia ‘Pink China’ has proven hardy in our garden. It spreads a little more each year and grows lush and reliable from May until November. I expect to find this whole stand knocked down by frost when we come out tomorrow morning.

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When we talk about  USDA agricultural zones, there are three variables in play; all very important for which plants you may grow.  First, dates of first and last frost are pretty standard across a given Zone.  For example, here in Zone 7, we expect our first frost around October 15, and our last freeze around April 15.  That gives us a solid six months of outdoor growing season, which means we can raise lots of different sorts of crops in our zone.  There is sufficient time for a plant to develop, bloom, and ripen fruit.  A few miles to the southeast, nearer the Atlantic, Zone 8 begins.  Zone 8 has later first frosts (November 15) and earlier last frosts (March 15).

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Colocasia have runners, and each runner will create a new little plant. These special stems run just at ground level. This is how a dense stand develops from a single plant. Were you to visit my garden, I’d offer you as many of these little Colocasia plants as you would take!

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So knowing your Zone (updated in 2012,) not only tells you how many weeks of the year you have a 50% chance or greater of having freezing temperatures, at least overnight; it also tells you how cold those temperatures may go.   Here in Zone 7b, we may experience a low between 5F-10F.  Most winters we never drop below the teens, here, but it is possible.  Zone 8 may have temperatures down to 10F, but Zone 9 wouldn’t expect temperatures to drop below 20F.

Knowing this helps me make choices about what to bring inside, where  to keep overwintering plants, and what to take a chance on leaving outside until spring.  When space is limited, hard choices must be made if one wants to share the house with the plants for the next six months!

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Colocasia ‘Tea Cups’ is hardy to Zone 7b. I still brought many of these plants in to hedge my bets, since we are right on the edge….

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If a plant is hardy to Zone 8, we sometimes have success keeping it outdoors when we provide mulch or significant shelter.  In a mild winter, we may not dip below 10F to begin with.   Plants with deep roots may be mulched, or may have a little shelter built around it with most anything that will trap and hold heat on those few cold nights.  Our patio is a great place to offer potted plants shelter through the winter.  It offers shelter from the wind, and also absorbs and holds a bit of heat on sunny days.

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A plant rated to Zone 9 or 10 will definitely need to come indoors in our area.  But because Aroids have a dormant period over winter, we can keep them in our low light but frost free basement.

As Colocasias and Alocasias grow more popular, enthusiasts are left deciding whether to try to save them for another season, or whether to start next season with fresh plants.   Sometimes space determines our choices, other times our budget.  That said, I’ve found four ways to keep these beautiful plants from one season to the next.

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Colocasia ‘Black Magic’ is hardy to Zone 8. We were fortunate to have one overwinter in a protected area, and this is an off-set I dug up in August to grow on. It is now safely tucked into our garage for the winter.

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I found two of our most spectacular Alocasias back in February, at Trader Joe’s.  They were right inside the door, with a few other pots of ‘tropical’ plants.  Because I recognized their leaf, I bought two, intending to use them in large pots to frame our front door all summer.  What came home in a 4″ pot, grew over summer into a huge and beautiful plant.  I learned today that their roots had completely filled the 20″ pots they have grown in since early May.

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This Alocasia, originally from Trader Joe’s, wasn’t labeled when I bought it last winter. It reminds me of A. ‘Regal Shields,’ but grows a bit larger.

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I can barely slide those pots when they are well-watered.  And, I plan to re-plant them for winter interest.  There was no question of trying to move them into our home or garage to overwinter the plants.

But last night I did my homework, and spent a while searching out how others have managed to overwinter large Alocasias.  Since the plant goes dormant, it can be kept, barely moist, out of its pot in a frost free basement or garage.    So I pried each of my beautiful Alocasias  out of their pots this morning, and lowered each, root ball intact, into a large paper grocery bag.  I’ve set the bags into shallow plastic storage boxes in our basement.  The leaves will wither; the soil will dry.  But life will remain in the plant, and I can pot it up again in spring for it to continue growing.

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How many plants? I didn’t count…. But here are four grocery bags filled with Aroids to sleep through winter in the basement.

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I decided to hedge my bets again this winter by storing our Aroids in a variety of ways.  While I’ve brought a few indoors in smaller pots to either keep growing in our living room, or slowly go dormant in our garage or basement; a great many got yanked from their pots this morning and stuffed into grocery bags.  Now the Alocasias will mingle for the next few months with A. ‘Stingray,’ C. ‘Mohito’, and C. ‘Tea Cups.’

C. ‘Tea Cups’ is supposed to be hardy in Zone 7.  Actually, we had one overwinter in a very large pot last year, but it was slow to emerge and never grew with much vigor over summer.  So again, I hedged my bets.

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A. ‘Stingray’ came home in a 4′ pot this spring. It has grown prodigiously, and there were several small off-sets. I pried these out of the wet soil, and am storing them in the grocery bags for winter.

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Remember, all of these plants create off-sets.  So, I left a few plants growing in the circular bed we began in spring.  But I pulled up enough to replant the bed next spring, if those don’t survive winter for whatever reason.  I have a few C. ‘Tea Cups’ overwintering in moist soil in pots, and others set to go dormant in paper grocery bags.

The very small divisions of Colocasia ‘Black Magic’ that I potted up in late summer came in to the living area in their pots, along with  A. ‘Sarian’ and a few A. ‘Amazonica‘.   I can give them window-sill space and keep them growing.  Even if you don’t have space to keep the largest of your Aroids, chances are good that there will be a small off-set that you can save over winter.

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For plants like Begonias and Brugmansias, which don’t create off-sets, consider taking cuttings if you need to conserve space. If you don’t have room for the whole pot or basket, cut a few vigorous branches to root in a vase or jar near a window.

Cuttings placed in water now will root, and may be potted up in early spring.  I always have Begonia cuttings rooting in vases of water, but I brought a few more cuttings in today.  We just have too many pots of Begonias to save them all.  But I am careful to save some of each variety.  Because plants like Begonias root so easily in water,  once you have a variety, you can keep it going indefinitely.

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Many, many plants will root in water.  I’ve experimented over the years with keeping many genus of plants going, because the nursery trade just isn’t that dependable when there is a particular variety you want to buy in spring.   Maybe you’ll find it, but maybe its shelf space will be given over to something newer or more fashionable, and your favored cultivar just won’t be available in your area.

My friends know that even if I had a good sized greenhouse, I’d soon fill it to the rafters like some botanical Noah’s Ark.  As it is, our living space is filled, once again, with my coterie of plants.  My partner is blessedly patient with my horticultural obsessions.

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Begonia ‘Richmondensis’ is an angel wing Begonia which performs well in a hanging basket.  A perennial in Zone 10,  you can overwinter it in its pot, or as a cutting.

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There is no shame in letting ‘annuals’ perish when winter finally blows into your garden.  But your Zone doesn’t have to limit what you can grow, and winter doesn’t have to destroy your beautiful collection of plants.

Master a few handy hacks, and you can keep your favorite warm-weather plants growing (and multiplying) indefinitely.

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A. ‘Amazonica’, also known as ‘African Mask’, grows vigorously in a large pot. I’ve kept this pot going for several years by letting it over winter in our living room..

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Woodland Gnome 2017
“Green Thumb” Tips: 
Many visitors to Forest Garden are amazing gardeners with years of experience to share.  Others are just getting started, and are looking for a few ‘tips and tricks’ to help grow the garden of their dreams.

I believe the only difference between a “Green Thumb” and a “Brown Thumb” is a little bit of know-how and a lot of passion for our plants.

If you feel inclined to share a little bit of what YOU KNOW from your years of gardening experience, please create a new post titled: “Green Thumb” Tip: (topic) and include a link back to this page.  I will update this page with a clear link back to your post in a listing by topic, so others can find your post, and will include the link in all future “Green Thumb” Tip posts.

Let’s work together to build an online resource of helpful tips for all of those who are passionate about plants, and who would like to learn more about how to grow them well.

‘Green Thumb’ Tip #1:  Pinch!

‘Green Thumb’ Tip #2:  Feed!

‘Green Thumb’ Tip #3 Deadhead!

‘Green Thumb’ Tip #4 Get the Light Right!

‘Green Thumb’ Tip #5: Keep Planting!

‘Green Thumb’ Tip #6: Size Matters!

‘Green Thumb’ Tip # 7:  Experiment!

‘Green Thumb’ Tip #8  Observe

‘Green Thumb’ Tip #9 Plan Ahead

Green Thumb Tip # 10 Understand the Rhythm

Green Thumb Tip # 11:  The Perennial Philosophy

Green Thumb Tip #12: Grow More of That! 

‘Green Thumb’ Tip:  Release Those Pot-Bound Roots! from Peggy, of Oak Trees Studios

 

Fabulous Friday: ‘Black Magic’

Colocasia esculenta ‘Black Magic’

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It has been a few years since I ordered Colocasia esculenta ‘Black Magic,’ and so it puzzled me a little when I noticed a few dark purple leaves peeking out among a stand of Colocasia, ‘Pink China’ around our bog garden.  Never one to quibble with gifts of nature, I said a silent ‘thank you!’ to the universe and let it be.

Its leaves were quite small, beneath the towering canopies of C. ‘Pink China,’ and they never particularly took off.  What with my extended absences from the garden in late June and July, and the punishing drought of July and early August, it is a wonder this remnant survived at all.

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Our bog garden in July, with  C. ‘Pink China’  backlit to show its beautiful color.

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But it did.  And it stubbornly kept pushing up leaf after leaf, despite everything.

It was mid-August before I followed through on my determination to rescue this plant from its less than hospitable spot.  It is the least I could do, considering that it has hung on through at least two winters and survived the crowding of our very rambunctious and energetic C. ‘Pink China’ growing all around it.

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After about 10 days in the pot, I was ready to move our little C. ‘Black Magic’ out into the sun of our perennial garden at the end of August.

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See what a little horticultural love can do?  From a single leaf on a bit of rhizome and root, our C. ‘Black Magic’ has not only rapidly grown in its pot, it has already grown an offset!  A second little plant has emerged inches away from the first.

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September 15, 2017,  C. ‘Black Magic has already grown an offset.

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It is a genuinely magical experience to watch this little guy grow!  At first, I set it in a shady spot for about 10 days to establish.  Once I saw evidence of new growth, I knew it wanted sun, and moved it out to this choice spot where I would keep it well-watered.  I expect to leave this Colocasia out in the garden until late October or early November.

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September 20

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Now that I know  it is winter hardy here, we can decide whether to move it to a sheltered spot on our patio, or into the basement when nights grow cold.

I have been watching for new leaves to emerge around the bog garden, too.  Surely, there are still a few of  its roots in that bed.  In fact, I dug two more tiny starts, each less than 3″ tall, earlier this week.  I’ve potted them up and set them in shady, sheltered spots to grow on.

I like this beautiful, dark purple leaf, and C. ‘Black Magic’ is known for growing into a spectacularly large plant.  Plant Delights Nursery, which offers this variety, reports that the plant will grow to 5′-6′ tall and wide when given rich, moist soil and plenty of sun.   They also suggest that it can stand winter temperatures down to 0F when grown in a sunny spot, well-mulched through winter.

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This variety is known to spread quickly, as many Colocasias will, with lateral stems which run just above or just below the soil.  New plants will spring up from the nodes, rooting  into whatever soil is available; eventually forming a thick patch of plants.

I have to say that didn’t happen in the areas where I planted this variety originally.  My guess is that the part of the garden where I first planted it was too dry for it to thrive.  I moved an offset from the original plant down to the bog garden a couple of years ago, where it eventually survived.

C. ‘Black Magic’ may be grown with its pot submerged or in a wet, boggy spot in the garden.  In fact, I’m growing C. ‘Mojito’ and C. ‘Tea Cups’ most successfully with their pots partially submerged.  These are thirsty plants, needing a  lot of water to hydrate their huge leaves on hot summer days.

But I’ve learned my lesson now, and will make sure to offer plenty of water from here on to keep these rescued plants growing strong!

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Colocasias love rich, moist soil. They will grow into a dramatic display when their needs are met.  Allow plenty of space, as most cultivars will grow to 4′- 5′.   From left:  C. ‘Pink China’, C. ‘Tea Cups’, C. ‘Mojito’, C. ‘Pink China’

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C. ‘Black Magic’ was originally spotted growing in the Philippines.  It was collected, grown on, and eventually introduced to the nursery trade.  It is a dramatic plant; a touch of the tropics which will thrive in a more temperate garden if simply given a little consideration and care.

I’m happy to have another chance to get it right with this beautiful plant.  Every season we learn a bit more, don’t we?  That is one of the fabulous gifts gardening gives us, always another chance to grow our gardens well.

Woodland Gnome 2017
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September 22 …  It is Fabulous how much this Colocasia has grown since we moved it to its pot about six weeks ago.  (Why the plastic dish?  The wet sand is there for the butterflies, who frequent this part of our garden.)

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Fabulous Friday: 

Happiness is Contagious!  Let’s infect one another!

 

 

Leaf VI: Perpetuation

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The garden starts looking a bit tired, by late August; and I’m certainly feeling a bit tired, too.  After all, we’ve been at this now since February when our gardening season began a bit prematurely, with a string of days in the 80s.  And we have a few more good months of gardening still ahead this year. 

The garden is getting a good, deep drink today.  It began raining here sometime after midnight, and I was awakened several times in the night, listening to the heavy rain pounding on our roof and on the trees.  And we needed this rain to soften and re-hydrate our summered out soil.

A storm is moving up the coast.  The forecast keeps shifting, of course, but we’ll harvest a few inches of rain before this low moves away from us and out into the Atlantic.

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This is the time when some might give up for the year.  After all, things look a bit overgrown and shabby after weeks of heat and too little moisture.  A lot of plants in the garden have pretty much finished up for the season, or are taking an untidy nap.

Things might have gotten a little out of hand while we were traveling this summer, or while it was too hot to reasonably work outside.

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Joe Pye Weed takes center stage in the morning sunlight last week.

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September, almost upon us, offers a reprieve and a fresh opportunity for us all.  Students get a new semester.  Adults return from vacation, refreshed.  And gardeners get a beautiful autumn in the garden.

Autumn may be the best gardening season of the year.  Many perennials have matured into their full potential for size.  The garden’s silhouette may be more full and lush than at any other time of the year.  Colors in both flowers and foliage are rich and intense.

The air is cooler, the sky bluer, and the sun less intense.  This is the best season to give new shrubs and perennials a chance to establish and grow their roots out into the surrounding soil during the cool of the year.

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Pokeweed has overgrown the Salvia, Colocasia and Hibiscus that have grown here for the last several summers. They are just holding on beneath its shade.

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I’ve been refreshing our garden, preparing for the change of seasons. I’ve been cutting back browned leaves and stems, lifting mats of grass growing into my beds, deadheading, and replacing dying annuals with something fresh.

It is a good time to visit your local garden center again, with an eye towards investment in your garden’s future.  Many are cutting prices on summer stock to make way for their fall chrysanthemums and other seasonal items.  I have scored some wonderful deals recently on clearance herbs, perennials, ferns and a few salvageable annuals.  I’ve also invested in several bags of my favorite ‘Leaf Grow’ compost.  I plan to buy a few bags of hardwood mulch later this week.

Most nurseries will mark down their summer stock by 30%- 60%, depending on the plant’s desirability and how late it is in the season.   A nursery I visited on Saturday was actually giving plants away for free, with a purchase.

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Persian Shield grows as an annual in our climate. I found this one on clearance last weekend, and have  taken cuttings from it to spruce up late summer pots.

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As you cut back spent perennials, or remove fried annuals, replenish the soil with some fresh compost and plant something that will look good for another few months.  I’ve planted small pots of bronze fennel, Echinacea, and Lantana ‘Bandana’ in full bloom, over the past week.  Earlier in the month, I planted a half dozen Mexican bush sage, Salvia leucantha, all of which are growing well.  I expect the Lantana and Salvia to grow enough to fill in empty spots with bright flowers until frost.

I also purchased a huge, overgrown Persian Shield, Strobilanthes dyerianus, for about $2.00.   I love the bright purple foliage of this striking plant.  It is sturdy, drought tolerant, and can tolerate sun.  After cutting it back, I re-potted it to replace an expiring annual.

But all of those branches I removed will root in a glass of water!  As each cutting roots, I’ll plant it into a potted arrangement that needs a bit of freshening.  You can perform this bit of garden magic with many of the blooming and foliage plants available now on clearance.

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Our cane Begonias are covered in blooms this week. Canes root easily in water.

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Although it is still way too early to plant winter annuals, you might find some good evergreen perennials or ferns mixed into the clearance at the garden center.  I have just planted two ‘Epimediums,’ saved from a jumble of pots marked down by half.  These usually pricey perennials have tough, leathery evergreen leaves.  Their early spring flowers look like sprays of tiny fairies dancing on the breeze.  I’ve planted them where I know Daffodils will emerge next February.

Perennial ferns were mixed into the same clearance sale.  Crowded, I was able to cut the clump of fern into several pieces, planting them a foot or so apart to spread the ferny joy in a shaded bed.

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My new ferns went into this shady bed where daffodils will emerge next spring.  Potted up are Alocasia ‘Stingray’ and Begonia ‘Gryphon.’  They will return next summer, after a long winter snoozing in the garage.

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Fall is a good time to divide growing clumps of perennials you already have growing in pots.  Knock the plant out of its pot, gently pull a few sections away, and pack the now empty spots with fresh soil.  Water well, and let your mother plant keep on growing.  You can pot up or plant each division elsewhere, and let it grow on.  You may want to shelter the new potted division in a shady spot for a few days to let it establish, before moving it on to its destined spot.

Use this same trick with perennials, like Colocasia, spreading by runners.  Moving offsets now will give them a few months to establish before the leaves are killed by frost.

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Colocasia ‘Mojito’ produces many offsets, which can be pulled off of the mother plant and potted up to grow quickly into mature plants like this one.

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I learned a new trick, last week, too.  Admiring a friend’s kitchen windowsill garden, I noticed her Caladium leaf had grown both roots and new leaves in a glass of water.  Her leaf had fallen over in a storm.  When she pulled it, it came with a bit of the tuber attached at the base of the petiole.  From that tiny beginning, a new plant was forming.  When she pots up the rooted leaf, a tiny tuber will grow from these new roots.

This is one way to increase your Caladium collection; though one shouldn’t do it with any new patented Caladium variety.

All sorts of bits of plants, trimmed away in a late summer clean-up, may be rooted.  My kitchen windowsill, and the bright space around my sink, is full of  cuttings rooting in bottles of water this week.  I plant these out into small pots of soil as their roots form.

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Pruning away spent flower clusters from many perennials and woodies will likely earn you fresh flowers before frost.  Keep those butterfly bushes, crape myrtles, Salvias, Dahlias, roses, and even Joe Pye weed dead-headed, and the new flower buds will keep forming.  You can extend your season of bloom for many more weeks with this attention to detail.

Always remember:  plants want to grow! It requires just a little effort on our part to assist them.

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Dead head spent flowers from woody shrubs, like this crape myrtle, to keep new flowers coming. Joe Pye Weed will also continue to produce flower buds if regularly trimmed of its old flowers.  Newly planted yellow Lantana and  bronze fennel now fill the empty spaces in the bed at left, where I’ve also added a bit of compost. The white flowers are self-seeding garlic chives.

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Once the rain has finished, I’ll head back out to the garden to top-dress many of our beds with an extra inch of compost.  And I’ll follow that with an inch or so of fresh mulch over the next week.  This will offer a little nutrition to the soil, and help lock in the moisture we’re receiving from this storm.  Our cadre of earthworms will appreciate the effort.

Gardeners learn many tricks to perpetuate the beauty of their garden year to year, and through the changing seasons.  We learn to multiply and nurture what we already have, and minimize what we might need to purchase season to season.

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Late planted Caladiums have struggled with heat and drought this summer. (photographed last Thursday, when I was keeping them watered by hand.)  Now that we’ve had significant rain, they will surely shine through the next few months.

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Woodland Gnome 2017
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“Many of life’s failures
are people who did not realize
how close they were to success
when they gave up.”
.
Thomas A. Edison
*
“A wise man
will make more opportunities
than he finds.”
.
Sir Francis Bacon

 

 

 

Blossom XXIX: Buddleia

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Buddleia davidii, or butterfly bush, hosts many hungry pollinators on its abundant, nectar filled blossoms each summer.    I enjoy the beautiful creatures it attracts as much as I enjoy its brilliant blossoms.

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Hummingbird moths are especially drawn to Buddleia.

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These deciduous shrubs tend to be short lived.  They want plenty of sun and prefer rich, moist soil.  We lost several over the last few years, and had only one remaining last fall.

Buddleia want to be frequently pruned.  The bloom on new growth, and produce abundant blooms until frost if you faithfully dead head their spent blossoms.

They also need to be cut back very hard each winter.  If left to grow unpruned, they can soon grow too tall and gangling, falling this way and that from their own weight.  That said, I’ve never had one grazed by deer.

When I pruned our butterfly bush  in the late fall, I was inspired to stick lengths of the pruned stems into a large pot, around a winter blooming Helleborus.  I wasn’t confident that these woody stem cuttings would root, but decided to take the chance.  By early spring, we noticed new buds and leaves appearing and we could tell roots had formed.

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I transplanted most of the rooted cuttings out into the front garden when I refreshed the pot in late spring.  But we left the largest and strongest in place to grow on this summer in the pot.

All of the rooted cuttings have put on abundant growth this summer and are now well-established and blooming.  A seedling Rudbeckia has also appeared in the pot along with a Caladium  I tucked in this May, some Verbena cuttings I planted in June, and a division of Dichondra argentea. 

If this sounds like shamefully haphazard planting, well…. what can I say?

The Hellebore took a long time to die back, as did the foliage of the daffodil bulbs still nestled deep in the pot.  Spreading Colocasia plants have sprung up all around, hugging the pot with their huge leaves.  It may look a bit wild and woolly, but I can promise you that the many hummingbirds, bees, butterflies and this lovely hummingbird moth are happy with the abundance.

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Plants basically want to live.  The magic of simple propagation, whether from stem cuttings, division or saved seeds; is their will to survive against all odds.

The next time you find yourself pruning, consider whether you have space or desire for more of the plant you’re trimming back.  Green stems generally root well in water.  Woody stems will root in soil or a soil-less medium like vermiculite or sand.

There are finer points to it, depending on the time of year you take your cuttings.  But why not take a chance and give those pruning an opportunity to root?  Look at the beauty you have to gain! This is an easy and inexpensive way to give yourself impressive small shrubs for your large pots, too.

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Propagate your way into a full, lush garden filled with plants that you like, and that grow well in your conditions.  Doesn’t it seem a bit magical that a blossom this beautiful will grow from a pruned stem, that would otherwise have been tossed away?

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Woodland Gnome 2017
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A blossom from the mother plant, still growing strong and covered in flowers.

 

Blossom XXV: Elegance
Blossom XXVI: Angel Wing Begonia
Blossom XXVII: Life 
Blossom XXVIII: Fennel 

 

Slow to Grow: Elephant Ears

Colocasia esculenta

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It has been agonizingly slow this spring, watching and waiting for our elephant ears to grow.  I blame the weather.  Wouldn’t you?

After all, we enjoyed 80F days in February, and then retreated back to wintery grey days through most of March.  We’ve been on a climatic roller-coaster since.

Gardeners, and our plants, appreciate a smooth transition from one season to another.  Let it be cold in winter, then warm gradually through early, mid and late spring until we enjoy a few weeks of perfect summer in late May and early June.  We know to expect heat in June, July and August, with moderating temperatures and humidity by mid-September.

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I started working on this new bed in March, bringing the still potted Colocasias in doors and back out with the weather. Although I planted them weeks ago, they are still sulking a bit in our cool, rainy weather this month.

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But lately, our seasons feel rather muddled.  That smooth crescendo from season to season has gone all rag-time on us.  We’ve already lost a potted Hydrangea Macrophylla teased into leaf too early, and then frozen a time too many.  Those early leaves dissolved in mush, but new growth started again from the crown.

I’ve watched the poor shrub try at least 3 times to grow this spring, and now it sits, bare, in its pot while I hold out hope for either a horticultural miracle, or a clone on sale; whichever comes first.

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Colocasia ‘Pink China’ loves our climate and spreads a bit each year. Its pink spot and pink stem inspired its name. This is the Colocasia I happily dig up to share with gardening friends. These will be a little more than 5′ tall by late summer.

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I hedged my bets last fall with the elephant ears.  I left some in situ in the garden, some in their pots, but pulled up close to the house on the patio, and I brought a few pots of Alocasia and Colocasia into our basement or garage.

I dug most of our Caladiums and dried them for several weeks in the garage, and then boxed and bagged them with rice hulls before storing them in a closet through the winter.  I left a few special ones in their pots and kept the pots in our sunny garage.

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Caladium ‘Florida Sweetheart’ overwintered for us  dried and stored in a box with rice hulls. I planted the tuber again in early April.

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And I waited until April before trying to rouse any of them.  But by early April, while I was organizing a Caladium order for 2017, I also planted all of those stored Caladium tubers in fresh potting soil and set them in our guest room to grow.  Eventually, after our last frost date in mid-April, I also retrieved the pots from the basement and brought them out to the warmth of our patio.  They all got a drink of Neptune’s Harvest and a chance to awaken for summer.

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Caladium ‘Desert Sunset,’ didn’t survive winter in our garage. (This photo from summer 2016)  I left them in their pot, but it must have gotten too cold for them.  Happily, I ordered new tubers this spring.

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Around this time I gingerly began to feel around in those Caladium pots kept in the garage, for signs of life.  I thought I’d divide and replant the tubers and get them going again.  But, to my great disappointment, not a single tuber survived.   The Caladiums succumbed to the chill of our garage sometime during the winter, and I had three generous sized, empty pots to recycle with fresh plantings.

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C. ‘Desert Sunset’ didn’t make it through the winter, so I’ve recycled the pot for other plants. Calla lily has a form similar to some Alocasia, and is more tolerant of cold weather. These are hardy in Zone 7.

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By the time our new Caladium order arrived in mid- April, the tubers I’d dried, stored, and replanted were in growth.  I moved them to the garage to get more light and actually planted the first batch of Caladiums outside by the first week of May.

I planted most of the new Caladiums into potting soil filled boxes and sent them off to the guest room to awaken, but chanced planting a few bare tubers into pots outside.  Mistake.

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These saved Caladiums, started indoors in April, moved outside to their permanent bed in early May. Still a little slow to grow, they have weathered a few cool  nights this month.

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Because for all the promising balmy days we’ve had this spring, we’ve had our share of dreary cool ones, too.  We even had a few nights in the 40s earlier this month!  It’s generally safe here to plant out tomatoes, Basil and Caladiums by mid-May.  Sadly, this year, these heat lovers have been left stunted by the late cool weather.

The new Caladium tubers planted indoors are still mostly sulking, too, with little to show for themselves.  The ones I planted directly outside in pots remain invisible.  I just hope they didn’t rot in our cool, rainy weather.

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Colocasia ‘Black Coral,’ started in a greenhouse this spring, has been growing outdoors for nearly a month now. This one can get to more than 4′ tall in full sun to part shade.

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Of the saved Colocasias and Alocasias, C. ‘Mohito’ has done the best.   I brought a large pot of them into the basement last fall, and knocked the plant out of its pot when I brought it back outdoors in April.   I divided the tubers and ended up with several plants.  They are all growing nicely, though they are still rather small.

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Colocasia ‘Mojito’ has been in the family a few years now. It overwinters, dormant in its pot, in our basement. This is one of 5 divisions I made at re-potting time this spring.

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I dug up our large C. ‘Tea Cups’ in October and brought it indoors in a pot, leaving behind its runners.  The main plant began vigorous growth again by late April, but none of the runners seem to have made it through the winter outdoors.

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Colocasia ‘Tea Cups’ also overwintered in the basement.  New last year, this plant has really taken off in the last few weeks and is many times larger than our new C. ‘Tea Cups’ plants.  It catches rain in its concave leaves, thus its name.

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I brought one of our Alocasia ‘Stingray’ into the garage in its pot, where it continued to grow until after Christmas.  By then the last leaf withered, and it remained dormant until we brought it back out in April.  It has made tiny new leaves ever so slowly, and those new leaves remain less than 6″ tall.

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Alocasia ‘Sting Ray’ spent winter in our garage.  It has been very slow to grow this spring, but already has many more leaves than last year.  It will eventually grow to about 6′.  Zone 8-11

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But that is better than the potted A. ‘Stingray‘ that overwintered on the patio.  We’ve been watching and waiting all spring, and I finally gave up and dug through the potting soil last week looking for any sign of the tuber.  I found nothing.

But, fearing the worst, we already bought two new A. ‘Stingray’ from the bulb shop in Gloucester in early May, and those are growing vigorously.   They enjoyed the greenhouse treatment through our sulky spring, of course.

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Our new A. ‘Stingray’ grows in the blue pot in front of where another A. ‘Stingray’ grew last year. I left the black pot out on the patio over winter, and the Alocasia hasn’t returned. I finally planted some of our new Caladiums in the empty pot last week.

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I have two more pots of Alocasia in que:  A. ‘Plumbea’ has shown two tiny leaves thus far, so I know it is alive.  A. ‘Sarian’ has slept in the sun for weeks now, its tuber still visible and firm.  Finally, just over this weekend, the first tiny leaf has appeared.  I expect it to grow into an even more  beautiful plant than last summer since.  It came to us in a tiny 4″ pot, and ended summer at around 5′ tall.  I can’t wait to see how large it grows by August!

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Alocasia ‘Plumbea’ isn’t’ available for order from Brent and Becky’s bulbs this year. I am very happy this one survived winter, because it is a beautiful plant.  Hardy in zones 3-10, this will grow to 5′.

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But the pot of Colocasia ‘Blue Hawaii,’ that overwintered on the patio, has shown nothing so far, either.  Hardy to Zone 8, I hoped the shelter of our patio might allow this two year old plant to survive.  Now, I’m about ready to refresh the soil and fill that pot with some of the Caladiums still growing in our garage.

C. ‘Blue Hawaii’ is marginal here.  A few have survived past winters planted in the ground; but thus far, I’m not recognizing any coming back in the garden this year.

I’ve planted a few C. ‘Mojito’ in the ground this spring, and plan to leave them in the fall to see whether they return next year.  But I will also hedge my bet and bring a potted C. ‘Mojito’ inside again so I’ll have plants to begin with next spring.

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C. ‘Mojito’ in our bog garden will soon get potted up to a larger container.  I planted a few of the smaller divisions of this plant directly into the ground to see if they will survive the winter coming. (Zone 8)

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Every year I learn a little more about growing elephant ears.  I know now that Colocasia ‘China Pink’ is vigorous and dependable in our garden.  There is no worry about them making it through winter, and I dig and spread those a bit each year.

The huge Colocasia esculenta I planted a few years ago with our Cannas dependably return.  These are the species, not a fancy cultivar.  But they seem to manage fine with nothing more than some fallen leaves for mulch.

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These gorgeous tropical elephant ears put on a great show for four to six months each year in our zone.  Deer and rabbits don’t touch them, and they rarely have any problem with insects or disease.   Our muggy, hot summers suit them fine.  They love, and need, heat to thrive.

Any temperate zone gardener who wants to grow them, needs to also plan for their winter dormancy.  And each plant’s needs are unique.  Some Colocasia might be hardy north to Zone 6.  A few Alocasia cultivars are hardy to zone 7b or 8, but most require zone 9 to remain outdoors in the winter.  Caladiums want a lot more warmth, and prefer Zone 10.  Caladiums can rot in wet soil below 60F.

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Hardy Begonias are naturalizing in this lively bed transitioning to summer.  I planted the Caladiums about a month ago, and they have slowly begun to grow.  See also fading daffodil leaves, Japanese painted ferns, Arum Italicum, and creeping Jenny.

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If you don’t have space to store elephant ears over winter, you can still grow them as annuals, of course.    That requires a bit of an investment if you like them a lot, and want to fill your garden!

My favorite source for Colocasia and Alocasia elephant ears, Brent and Becky’s Bulbs,  has put all of their summer bulbs, including Caladium tubers,  on clearance now through Monday, June 5.   This is a good time to try something new, if you’re curious about how these beautiful plants would perform in your own garden, because all these plants are half off their usual price.  The Colocasia and Alocasia plants they’re selling now come straight to you from their greenhouses.

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Alocasia ‘Sarian’ emerged over the weekend. This is a very welcome sight!

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I order our Caladiums direct from the grower at Classic Caladiums in Avon Park, Florida (see below).  There is still plenty of time for you to grow these from tubers this summer, as long as your summer nights will be mostly above 60F for a couple of months.  Potted Caladiums make nice houseplants, too, when autumn chills return.  (Brent and Becky’s Bulbs buy their Caladiums from Classic Caladiums, too.  You will find a much larger selection when you buy direct from the grower.  Classic Caladiums sells to both wholesale and retail customers.)

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Slow to grow, this year, but so worth the wait.  We are always fascinated while watching our elephant ears grow each year, filling our garden with their huge, luscious leaves.  Once they get growing, they grow so fast you can see the difference sometimes from morning to afternoon!

Our summer officially begins today.  Now we can settle in to watch the annual spectacle unfold.

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Woodland Gnome 2017
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Is your region too cool for tropical Elephant Ears? Get a similar effect with rhubarb. This rhubarb ‘Victoria,’ in its second year, emerges in early spring. Leaves have the same basic size and shape as Alocasia leaves without the shiny texture. There are a number of ornamental rhubarbs available, some of them quite large.  These are easy to grow,  perennial north into Canada, and grow into a beautiful focal point in the garden.

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