A woodland garden asks for patience, but it repays it generously. The trick is timing. While the trees are still bare, the ground beneath them is briefly bright, and that window of light is exactly what spring bulbs evolved to exploit. Plant in autumn, and by the time the canopy closes overhead in May, the season's work is finished and the bulbs are quietly retreating below ground.

Why Deciduous Shade Suits Spring Bulbs

A bulb is a battery, not a root system. Everything it does above ground is powered by what it stored the previous year, and to top those reserves up it needs sunlight on green leaves for several weeks after flowering. Under a deciduous oak, ash or hazel, that light arrives in February and lingers until early May. Under an evergreen holly or a dense conifer hedge, it never arrives at all, which is why bulbs sulk and eventually vanish in that sort of shade.

So the first job is not choosing varieties but reading the light. Watch the ground in early March: is it dappled for four hours, or gloomy all day? Aim for the dappled patches, and the edges where woodland meets lawn, where bulbs can spill out into brighter ground and naturalise freely.

Native and Naturalised Bulbs to Rely On

The most rewarding bulbs are those that multiply gently by themselves, asking nothing but a little leaf mould and an undisturbed spot. Look for native species and long-established naturalised ones, and plant them in numbers rather than ones and twos.

• Snowdrop (Galanthus nivalis) — best bought and moved in the green in late February and March, when the roots are active. Dry bulbs work, but they resented drying and often take a season to settle.
• Native daffodil (Narcissus pseudonarcissus) and the Tenby daffodil — small, pale, and far better suited to grass and leaf litter than any showy garden variety. Plant 15cm deep.
• Native bluebell (Hyacinthoides non-scripta) — deep violet, one-sided flower spikes, nodding heads and a sweet scent. Plant bulbs 10cm deep and 10–15cm apart, or buy in the green. Avoid the Spanish bluebell and its hybrids, which dilute the native stock.
• Wood anemone (Anemone nemorosa) — sold as rhizomes. Lay them 3–5cm deep in leaf mould and let them creep into sheets. A sure sign of ancient woodland.
• Winter aconite (Eranthis hyemalis) — soak the tubers overnight, then plant 5cm deep. The first gold of the year, opening to any weak sun.
• Cyclamen coum — plant the tubers just at the surface, barely covered, in dappled shade. Winter flowers over marbled leaves.
• Wild garlic (Allium ursinum) — wonderful in damp shade, delicious in soup, and thoroughly thuggish. Give it a corner it can own.

Plant in Drifts, Not Rows

Nothing looks more artificial in a wood than a straight line of bulbs, or a neat alternating pattern. Take a handful of bulbs and throw them lightly across the ground, then plant each one exactly where it lands. Repeat with a second species in a different area rather than mixed through the first.

Think in drift sizes. A group of five snowdrops reads as an accident; fifty reads as a colony. It is better to plant one species generously in one place this autumn than to scatter a dozen different bulbs thinly across the whole garden.

Depth, Spacing and Soil Preparation

The old rule holds: plant bulbs at roughly two to three times their own height, measured from the base of the bulb to the soil surface. Smaller bulbs go shallower — snowdrops at 10cm, crocus at 8cm, aconites at 5cm. In light sandy soil, go a little deeper; in heavy clay, plant slightly shallower and work in grit or compost below the bulb to stop it sitting in water.

September to November is the window; tulips can wait until November. Fork the ground first to a spade's depth, working in well-rotted leaf mould rather than rich manure. Afterwards, mulch lightly with leaf mould and mark the spots with short sticks so you do not spear them later.

Letting the Foliage Ripen

This is where most woodland plantings are lost. After flowering, the leaves must stay in full sun for at least six weeks, feeding next year's bulb, before they yellow and collapse. Do not cut, mow, tie in knots or braid the foliage. Tidy around it, note where it is, and wait.

Where bulbs grow in grass, leave the whole patch unmown until the leaves have died down completely, usually late June. Then cut and rake off the clippings.

Notes Through the Seasons

January brings aconites and the first snowdrop noses. February and March belong to snowdrops, cyclamen and the early daffodils, and it is the best month to lift and divide congested snowdrop clumps in the green. April opens the wood anemones and the last of the native daffodils, with wild garlic scenting damp corners. By May the bluebells take the stage beneath the closing canopy, and the year's quiet machinery is already running underground.