Why Hazel Is the Perfect First Tree to Learn

Hazel is generous to beginners. It grows almost everywhere in lowland Britain, it holds its identity through every season, and it gives you three unmistakable clues — catkins, coppiced stems and nut clusters — so you are rarely left guessing. If you walk sheltered valley paths in early spring, you will meet it constantly, usually as a thicket of slender stems on a hedge bank or the edge of an old wood. Get your eye in on hazel and the rest of the woodland starts to read like a familiar map.

It is also a tree that rewards attention. Learn its shape and you begin to understand how British woodlands were worked for centuries, which in turn tells you where the good paths, the dry pitches and the quieter river pools are likely to be.

Reading the Catkins

From January onwards, hazel hangs out its lambs' tails. These are the male catkins: soft, yellow-green, pendulous cylinders that lengthen and brighten as the weeks pass, shedding clouds of pollen on a mild breeze. They dangle in twos and threes from short stalks along the twig, and they are the single easiest thing to spot on a bare hedge in late winter.

Look closely on the same twigs and you may find the female flowers, which are far more modest — a small green bud with a tuft of crimson styles poking out, like a tiny scarlet star. Both sexes sit on the same tree, so one hazel is enough to set seed.

Two similar catkins can trip you up. Alder also flowers early, but its catkins are shorter and stubbier, and its twigs usually carry small, woody cones left over from the previous year. Birch catkins are shorter still, and the tree behind them will be pale-barked with fine, drooping twigs. Hazel catkins are the long, soft, swaying ones.

Coppice Stools: The Shape of the Tree

Hazel rarely grows as a single clean trunk in managed British woods. Instead, a whole cluster of stems springs from one base — the coppice stool. Older stools can be several feet across, carrying dozens of poles, and some are centuries old. This multi-stemmed habit is the giveaway, and once you know it you can spot hazel across a field in midwinter.

The bark is smooth and grey-brown, marked with pale raised lenticels. The buds are oval, greenish-brown and slightly hairy, arranged alternately along the twig rather than in opposite pairs. The shoots themselves are flexible — bend one gently and it will curve without snapping, which is exactly why hazel was cut for hurdles, thatching spars and walking sticks.

Traditional woodlands were cut on a rotation of roughly seven to fifteen years. Those cut stems, or unders, throw up straight new poles from the stool. Where you see a wood full of hazel stools of similar size and age, you are walking through a working coppice, even if it has not been cut for decades.

Leaves, Nuts and the Autumn Payoff

In spring the leaves unfurl a little after the catkins. They are roundish, with a short pointed tip and a doubly toothed edge, soft to the touch and slightly downy when young. They turn a clear yellow in autumn.

The nuts follow in late summer and autumn, ripening from green to brown. They grow in clusters of one to four, each nut wrapped in a leafy green husk. If the husk is shorter than the nut inside, you are looking at common hazel. If the husk extends well past the nut in a long, ragged tube, it is a filbert — often planted, sometimes naturalised.

Resist the urge to fill your pockets. Hazel nuts are a mainstay for dormice, red squirrels and jays, and the jay is the tree's best friend, burying nuts and forgetting where it put them. Take a few for a mid-walk snack if there are plenty, and leave the rest.

Other Woodland Trees Worth Knowing

• Alder — damp ground and riverbanks; stalked purple-brown buds, and small cones that stay on the tree all year.
• Ash — opposite pairs of stout black buds, unmistakable against a winter sky; later, bunches of winged keys.
• Willow — narrow leaves and long, flexible shoots, often leaning over water; catkins appear alongside hazel's.
• Birch — white peeling bark and fine twiggy growth, a pioneer of open ground.
• Oak — clustered buds at the twig tips, and the only common broadleaf with lobed leaves.

These five, alongside hazel, will identify most of the woodland you cross on a typical valley walk. Alder and willow together are a particularly useful pair for outdoor people: they mark wet ground, streams and the edges of pools where the water is deep enough for a proper swim.

Fieldcraft for Valley Walks and River Swims

Use trees as a reading of the ground underfoot. Hazel stools on a sloping bank usually mean old coppice and dry, well-drained soil — good for a brew stop. Alder and willow in a line means water, often a reliable path beside it.

Watch for the plants that keep hazel company: dog's mercury, wood anemone and bluebells all suggest ancient woodland, and ancient woodland usually means a decent trail and a sheltered pitch.

Finally, treat woodlands gently. Do not cut living hazel without the landowner's permission, and if you do need dead wood for a small fire where it is allowed, take only what is already down and dry. Leave every stool as you found it, and the next person along the path gets the same lambs' tails in January.