Shade is a habitat, not a problem

Most of the wildflower advice you'll read assumes blazing sunshine, thin soil and a south-facing slope. That is fine if you happen to garden on a chalk down. But many of us are working with the strip along a north wall, the patch under an old apple tree, or the corner behind the shed that never quite dries out. The good news is that Britain's native flora includes a whole community of plants adapted to exactly these conditions — the woodland edge and hedgerow species that evolved beneath a shifting canopy of leaves.

The first job is to work out what kind of shade you have. It changes almost everything about what will thrive.

• Dappled shade — the light filtered through a mature tree, bright in spring, dimmer by midsummer. The richest option, and closest to a true woodland edge.
• Dry shade — under conifers, eaves or dense evergreens, where rain rarely reaches the soil. The hardest, but not hopeless.
• Damp or wet shade — north-facing clay, beside a downpipe, at the foot of a wall. Often surprisingly productive.
• Deep, constant shade — a passage between buildings, say. Better suited to ferns and ivy than to flowers, so consider it a green corridor rather than a meadow.

Plant the woodland edge, not the meadow

Forget cornfield annuals such as poppies and cornflowers; they need open, disturbed, sunny ground and will sulk and vanish in shade. Instead, think of the plants you would find along a hedge bank or in a clearing: things that flower early before the canopy closes over, or that tolerate root competition and leaf litter.

For spring colour in dappled or damp shade, try primrose, wood anemone, lesser celandine, wild garlic (superb in damp shade, though it spreads willingly) and native bluebell. Add wood sorrel for a low carpet and sweet woodruff for scent.

As the season turns, red campion, greater stitchwort, foxglove, herb Robert, hedge woundwort, bugle and selfheal will carry the border through early summer. Foxgloves are short-lived but seed themselves generously in exactly the kind of disturbed, leafy ground you are creating.

For late colour, look to betony, wood sage, meadowsweet in damper spots and devil's-bit scabious, which is one of the best late nectar sources you can grow. Underneath it all, sow or plant shade-tolerant grasses such as wood melick, wood millet or false brome to give the border structure rather than a thatch of ryegrass.

Preparing the ground without wrecking it

Under trees, the soil is usually dry, hungry and packed with roots, and the leaf litter suppresses seedlings. You cannot dig deeply without damaging the tree, so work with what you have.

• Clear ivy, ground elder and other thugs by hand, and keep clearing. They will return.
• Rake off excess leaf litter to expose small patches of soil — seeds need contact with the ground to germinate.
• Do not add rich compost or fertiliser. Fertility encourages soft, leafy growth and weeds at the expense of flowers.
• Mulch with leaf mould instead, which mimics woodland conditions and holds moisture without feeding too much.
• Plant in autumn, when the soil is warm and damp and roots can settle before winter.

Plug plants establish far more reliably than seed in shade, especially in dry spots. Aim for roughly six to nine plugs per square metre, planted in loose drifts rather than neat rows, and water them through their first summer.

Seed, patience and the spring window

If you want to sow, choose a shade or woodland-edge mix rather than a general meadow mix, and sow in late summer or autumn. The trick in shady gardens is timing: sow thinly onto bare patches in September, let the winter weather work the seed into the soil, and expect germination to be patchy and gradual. Spring-flowering species need to complete their growth before the canopy closes, so a light rake in February — just enough to open up the leaf litter — can make a real difference.

Give it three years. Shade borders establish slowly, then suddenly look as though they have always been there.

Gentle maintenance

The traditional hay cut is too brutal for shade. Instead, use a two-stage approach.

• Late June or July: cut the areas that flowered in spring, once seed has dropped, to around 10cm. Rake off the cuttings.
• Late August to September: the main cut, again removing all clippings so you are not returning nutrients to the soil.
• Winter: leave most stems standing until March. Seed heads feed birds, and hollow stems are winter homes for insects.
• Spring: tidy only lightly, and never strim right down to the soil.

Resist the urge to mulch heavily each year, and never use weedkiller or slug pellets in the border. A light hand is the whole point.

Making the border work for wildlife

A shady wildflower border punches well above its weight for wildlife, because it offers damp shelter as well as nectar. Native plants support far more invertebrates than most garden cultivars, and that is what feeds the birds and bats.

Leave a small log pile or a heap of stones in the darkest corner for beetles, frogs and overwintering queens. Allow a patch of bare, undisturbed soil for solitary bees and mining bees. Keep a shallow dish of water at ground level so hedgehogs and birds can drink safely. Finally, plant in generous clumps — a single foxglove is a pretty thing, but a drift of betony, campion and scabious is a proper larder for bees, hoverflies and moths well into autumn.