Fourth Dimensional Winter Pots

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Gardeners work in the first three dimensions of height, depth and breadth with every shrub, herb, perennial or creeping ground cover that we plant.  When we plant bulbs (or tubers)  in one season to enjoy in the next,  we also work in the fourth dimension:  time. 

Planting spring flowering bulbs on a chilly, autumn day feels like an act of faith; faith in the future, and faith in the magical forces of nature which will transform these little brown lumps into something fragrant and beautiful.

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Daffodil bulbs, ready and waiting to be planted so they can awaken to new growth.

It is easy enough to dig some holes and bury a few bulbs in the ground as one contemplates the holidays.

But there is artistry in composing a floral composition which will unfold gradually, over several weeks and months.

I learned about this more interesting approach from Brent Heath, master horticulturalist and owner of Brent and Becky’s Bulbs in Gloucester, VA.

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Spring bulbs open over a very long season, in our climate, from February through May.  When you consider the ‘winter bloomers’ that may be paired with bulbs, like Violas, Cyclamen, Dianthus, Daphne, Hellebores and Galanthus; as well as evergreen foliage plants like certain ferns, ground covers, herbs,  Arum itallicum and moss; you have an impressive palette for planting a ‘fourth dimensional’ potted arrangement.

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Hardy Cyclamen species bloom over a long season from late autumn through mid-spring, Their beautiful leaves persist for months. Purchased and planted like bulbs, these little perennial plants thrive in shade to part sun.

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The recipe is simple:  begin with a large pot (with drainage holes) and a good quality potting mix.  Amend that potting mix with additional compost or a slow release fertilizer like Espoma’s Bulb Tone.  You will have much better results if you begin with a good quality, fortified potting mix.  Make sure that there is excellent drainage, as bulbs may rot if the soil is too wet.  You might add a bit of sand or perlite if your potting mix isn’t porous.

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Naturalized Cyclamen beginning their season of bloom at the Connie Hansen garden in Oregon.

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Lay a foundation in the pot with a shallow layer of  gravel or a length of burlap laid across the drainage holes.  This helps keep moisture even and blocks creatures who might try to climb up into your pot from the drainage holes.

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The fun, creative part comes from choosing what to plant in each pot.  Keep in mind that different types of bulbs bloom at different points during spring awakening.  I try to plan for something interesting in the pot from late fall through the winter months.  Violas or pansies, ivy, moss, Arum italicum, Cyclamen, Hellebores, snaps, evergreen ferns, Saxifraga, or even evergreen Vinca will give you  some winter green in your pot, and foliage ‘filler’ and ‘spiller’ once the bulbs bloom next spring.

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When I removed a Caladium last week, I tucked a Cyclamen tuber into this pot of ivy by our kitchen door. We keep something interesting growing in this pot year round.

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Next, choose bulbs which will bloom in late winter or early spring, some for mid-spring, and possibly even something that will extend the season into late spring.   As you choose, remember that even within a given genus, like Narcissus, you will find cultivars blooming at different times.  For example, plant a very early Narcissus like ‘Rijnveld’s Early Sensation’ and a later Narcissus, like ‘Obdam,’ together in the same pot to extend the season of bloom.

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Also keep in mind that there are taller and shorter flowers growing from bulbs.  A Crocus or Muscari may grow to only 3″-6″ high.  Miniature Narcissus may top out at only 6″-8″.  But a large Narcissus or tulip may grow to 18″-20″ tall.  Plan your bulb arrangement with the flowers’ heights in mind.

Mixing many different bulbs in the same pot is possible because different bulbs are planted at different depths.  You can plant in layers, with the largest bulbs near the bottom of the pot.

Once you have all of your bulbs and plant material, put about 4″ of amended soil in the bottom of your pot, and arrange the first layer of bulbs nestled into the soil so there is at least an inch or two of soil below them for their roots to develop.  Cover these bulbs with more soil, and plant another layer of bulbs.  Keep in mind spacing, so that all of your layers will have room to emerge next spring.

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If your pot will contain a small tree, shrub or perennial, like a Hellebore or holly fern, place this (not directly over any bulbs, remember) and fill in soil around it.  Likewise, plant any small annuals, like Violas or snapdragons at the correct depth.  Finally, fill your pot with soil up to within an inch or so of the rim.  Make depressions with your finger for the smallest of bulbs that are planted only an inch or so deep.  This would include tubers for Arum, Cyclamen, winter Iris, etc.

Smooth the soil with your hand, and add a shallow layer of fine gravel or a covering with living moss.  When planting mosses, firm these into the soil and keep them moist.  Fill any crevices between pieces of moss with fine gravel.

The bulbs will easily emerge through the moss, which will remain green all winter so long as you keep it moist.

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Water your finished pot with a dilute solution of fish emulsion.  Brent Heath suggests allowing the pot to drain, and then watering again another time or two so that all of your soil is well moistened.  The fish emulsion ( I use Neptune’s Harvest) has a dual purpose.  It helps establish the plants with immediate nutrition, but it also helps protect this pot from marauding squirrels or deer.  The fish smell will deter them.

If your pot is likely to be investigated by wildlife, try throwing a few cloves of raw garlic in among the gravel.  Garlic is another useful deterrent, and eventually may root in your pot.

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Violas in late March with Heuchera, Daffodils, and Dianthus.

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I planted five of these bulb filled pots on Friday, and added Cyclamen or Arum tubers to several already established pots where I had just removed Caladiums to save them over winter.  I am giving several of these newly planted pots as Christmas gifts, and so have simply set them out of the way in a protected spot outdoors.

Once watered, you can largely forget about these pots for a month or so.  They only need light if you’ve included plants already in leaf, or moss, in your design.

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When the bulbs begin to emerge in late winter, move your pots to a sunny location.  Keep the pots moist once the bulbs begin to show green above the soil, and plan to water daily once the flowers are in bud and bloom.  Bulbs grow extensive roots.  You will be amazed how much they grow, and will want to provide plenty of water to keep them going once the weather warms next spring.

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Crocus with ferns and Ajuga

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If you have planted up bulbs with perennials, hardy ferns, or a shrub with winter interest, then by all means put them out now, where you will enjoy them.  Then you can simply watch and wait as the show unfolds.

Time is the magical ingredient for these intriguing ‘fourth dimensional’ winter pots.

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Woodland Gnome 2017

 

 

About woodlandgnome

Lifelong teacher and gardener.

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