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Choosing the Best Spring Bulbs for Shady Borders

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  • 24th March 2019
Choosing the Best Spring Bulbs for Shady Borders

Shady borders can feel like the awkward corner of the garden. Nothing seems to thrive, the soil is often dry and rooty, and by midsummer the whole area is in deep gloom. But shift your attention to the first three months of the year and everything changes. In February and March, the trees above are still bare, and a surprising amount of light reaches the ground. That window, before the canopy closes, is when woodland bulbs do their work — and it is one of the most rewarding things a cottage gardener can plan for.

Understand the Light Window Before You Plant

The key to success in shade is timing rather than tolerance. Most spring bulbs are not shade plants at all; they are plants that exploit a gap. Snowdrops, daffodils and wood anemones all evolved on the floor of deciduous woodland, where they complete their entire season of growth, flower and seed set before the leaves above unfurl.

That means you can plant far more boldly than you might expect. A north-facing border beneath an old apple tree, a strip along a hedge, or the ground under a mature oak will all support bulbs provided the soil is not waterlogged and the area gets a few hours of filtered light in late winter.

What matters most is the soil. Shade under trees is usually dry, dusty and full of fine roots competing for every drop of moisture. Before planting anything, fork in a generous barrowload of leaf mould or well-rotted garden compost per square metre. This holds moisture, feeds the bulbs and makes it far easier to get a trowel into the ground.

Snowdrops: The First Reliable Reward

No shady border is complete without snowdrops. They are tough, long-lived and increase steadily once settled, forming those lovely milky drifts that signal the end of winter.

  • Galanthus nivalis, the common snowdrop, is the cheapest and most willing to multiply. Plant it in quantity rather than in ones and twos.
  • Galanthus elwesii is taller and more robust, with broad grey leaves, and copes well with drier shade.
  • Double forms such as Galanthus nivalis 'Flore Pleno' are slower to spread but add a ruffled, old-fashioned charm.

The best time to move or divide snowdrops is in the green, immediately after flowering while the leaves are still active. Bare bulbs bought dry in autumn can work, but they resent drying out and often sulk for a year or more. Plant them about 8cm deep, in small clumps of five to ten, and water them in well. Sprinkle a little leaf mould over the surface each autumn and they will look after themselves.

Daffodils That Cope With Dappled Shade

Daffodils are the backbone of any naturalised planting, but not all are equal under trees. The big, blowsy trumpet varieties bred for cutting need more sun to flower well. Look instead towards the smaller, woodland types.

  • Narcissus pseudonarcissus, the native wild daffodil, is shorter, paler and utterly charming among rough grass.
  • 'Tête-à-Tête' is compact, floriferous and superb at the front of a border or beneath shrubs.
  • Narcissus poeticus var. recurvus, the pheasant's eye, flowers late and naturalises beautifully in damp shade.
  • 'Thalia' is a graceful white multi-headed form that lights up a dark corner without shouting.

Plant daffodils at roughly three times their own depth — about 15cm for most — and space them 10–15cm apart. In heavy clay, sit each bulb on a handful of grit or sharp sand to stop it rotting over winter. Left undisturbed, most will flower for decades and multiply into generous clumps.

Wood Anemones and Other Woodland Treasures

Wood anemones are the quiet stars of a shady border. Anemone nemorosa carpets the ground with starry white flowers in March and April and then disappears entirely by June, which makes it an ideal companion for later perennials.

Its roots are slender and brittle, so buy plants in pots or as rhizomes in early spring and handle them gently. Plant just 3–5cm deep in humus-rich soil and keep them moist for the first season. Once happy, they will spread slowly into a beautiful, low-maintenance carpet. Named forms such as the lavender-blue 'Robinsoniana' or the double white 'Vestal' are worth seeking out.

Alongside them, consider a few other willing naturalisers:

  • Winter aconite (Eranthis hyemalis) — buttercup-yellow flowers in January and February, happiest in damp shade.
  • Cyclamen coum — neat rounded leaves and bright pink or white flowers from midwinter onwards.
  • Snake's head fritillary (Fritillaria meleagris) — for a damp, meadowy corner beneath fruit trees.
  • Chionodoxa and scilla — inexpensive, bright blue and quick to bulk up.

Planting in Layers for a Longer Season

Few of us have endless space in the shade, so make the ground work harder by layering bulbs at different depths. This "lasagne" approach is simple and very effective.

Dig out a patch to about 20cm, fork the base, and place the largest and latest bulbs — daffodils and fritillaries — at the bottom. Cover with a few centimetres of soil, then set snowdrops and cyclamen in the middle layer. Finish with the smallest early bulbs, such as crocus and winter aconite, just below the surface. Mark the area with a discreet label or a few short canes so you do not slice through it later with a hoe.

If you garden on heavy clay, plant on a slight ridge rather than in a hollow, and add grit liberally. Bulbs rot far more readily in winter wet than they suffer from cold.

Aftercare: The Patience That Pays

The single most important rule with naturalising bulbs is to leave the foliage alone. Those leaves are the bulb's solar panels, and cutting them back early starves next year's flower. Wait at least six weeks after flowering, until the leaves have yellowed and collapsed, before tidying them away.

In a border that also holds herbaceous plants, this is easy — the emerging hostas and hardy geraniums will hide the dying foliage for you. Under grass, simply delay the first cut until late May or early June.

Feed once a year with a light scattering of blood, fish and bone as the shoots break the surface, and divide congested clumps of snowdrops every few years while still in leaf. Do that, and a dull corner beneath the trees will quietly become the most looked-forward-to part of your garden each spring.

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Autumn is ideal for planting, dividing perennials and clearing spent growth. Collect leaves for leafmould, prune lightly and protect tender plants before frost arrives.

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19th May 2018 Reply

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19th May 2018 Reply

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Roboto Alex
21th May 2018 Reply

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