The Woodland Calendar Begins Before the Leaves

For a few short weeks each spring, British woodland does something remarkable. The trees are still bare, the canopy is open, and light floods down onto the woodland floor for the last time before summer. The plants that live there have evolved to seize that window, flowering and setting seed before the shade closes over them.

This is why a country walk in spring feels so different from the same walk in July. The earliest showings begin in the mild, damp south-west from late February, and the same displays arrive a fortnight or more later in the north and at altitude. Height matters as much as latitude: a wood at 250 metres can be a fortnight behind a valley bottom only a few miles away. If you miss the bluebells at one site, a hillier or more northerly wood may still be at its peak.

Wood Anemones: The First Real Carpets

By mid-March, wood anemones are opening across the woodland floor. Each flower has six or seven white petal-like sepals, often washed with pink on the underside, and they behave like small sundials: open in sunshine, closed at night and on grey days. A whole colony can seem to vanish when cloud covers the sun, then reappear within minutes.

Look at the leaves and you have a reliable identification. Wood anemone leaves are deeply divided and fern-like. Wood sorrel, which often grows alongside it, has distinctive three-part, clover-like leaves. And if you find anemones, you are almost certainly standing in ancient woodland — a site continuously wooded for centuries. They spread by creeping rhizomes rather than seed, at perhaps a metre a century, so a dense carpet represents a very long history.

Bluebells and the Blue Haze of Late April

Native bluebells are the spectacle most people come for, and they rarely disappoint. Peak flowering usually falls between mid-April and late May, the southern lowlands first. The classic native bluebell has deep violet-blue flowers arranged on one side of a gently drooping stem, narrow tubular bells with curled-back tips, creamy white anthers, and a sweet, distinctive scent.

Spanish bluebells, widely planted in gardens, are paler, more upright, carry flowers all round the stem, have no scent and much broader leaves. Hybrids are common near towns and gardens, which is one reason native bluebell woods are so valued.

The best displays tend to be in old, lightly managed woods on slightly acidic, well-drained soils, often under oak, hazel and birch. Bluebells are easily damaged by trampling — the leaves feed the bulb for next year — so stay on the paths and resist the urge to pick. It is also an offence to uproot wild plants without the landowner's permission.

Wild Garlic: The Green Smell of May

By the time the bluebells begin to fade, wild garlic — ramsons — takes over the damp, heavier soils, often along streams and in hollows. You will usually smell it before you see it: a warm garlic scent drifting through the trees. The flowers are white stars on triangular stems, held above broad, soft, lance-shaped leaves.

If you want a few leaves for the kitchen, take one or two from the centre of a large patch, never lift a bulb, and crush a leaf to confirm the garlic smell before you use it. Leaves are tenderest before the flowers open. Smell is the reliable test, since the leaves of lily-of-the-valley and young lords-and-ladies can look superficially similar.

A Succession, Not a Single Event

Wood anemones, bluebells and wild garlic are only the headline acts. Keep walking through April and May and you will notice the cast changing week by week.

• Wood sorrel: clover-like leaves and white, pink-veined flowers, often beside anemones.
• Greater stitchwort: starry white flowers on grassy rides and edges from late April.
• Early purple orchid: purple spikes with spotted leaves, on chalk and limestone woods.
• Yellow archangel: a dead-nettle relative with yellow flowers, typical of old woods in May.
• Pignut: feathery leaves and tiny white umbels, a good indicator of long-established pasture woodland.

Later still, as the canopy closes, the woodland floor gives way to ferns, honeysuckle and foxgloves.

Getting the Most From a Spring Walk

A little planning makes a big difference. Go early in the morning: the light is softer, the birdsong is at its best, and you will have the paths largely to yourself. A damp, mild spell brings flowers on quickly; a cold snap holds them back, so a warm April can move everything forward by a week or two.

Take a small hand lens and a pocket guide, and look closely at one flower rather than scanning a whole carpet. Wear boots you don't mind muddying, since spring woodland paths are often wet. Keep dogs on the path in bluebell woods, and never walk into a flower carpet for a photograph.

Finally, treat the season as something to follow rather than a single day out. Start low and early in the south, then move north and uphill as the weeks pass. The same wood will look entirely different a fortnight later — and that changing display is half the pleasure.