White Willow

White willow is a fast-growing, moisture-loving tree commonly found beside rivers, streams, lakes and other damp places across Britain. Its long, narrow leaves have a distinctive pale, silvery underside, giving the tree its name. For bushcraft, white willow is worth learning to recognise because willow wood and shoots have a range of traditional practical uses, and the tree is a familiar feature of wetland environments.

White willow belongs to the genus Salix, which includes many British willows and sallows. Identifying the exact species can be challenging because willows vary in appearance and can hybridise. The combination of long, narrow leaves, pale undersides, mature bark and habitat can help with identification, but leaves alone may not be enough to confirm the species.

The tree is particularly associated with waterways and floodplains, where its extensive root system can help stabilise banks. Its flexible young growth has traditionally been useful for weaving and tying, although suitability varies with the age and condition of the material. Willow wood is relatively soft and can be used for certain lightweight projects and traditional crafts.

White willow also has a notable history in herbal medicine because its bark contains salicin-related compounds. This does not mean that harvesting or preparing the bark yourself is a safe substitute for a regulated medicine. Willow identification, harvesting permissions and responsible use all matter when studying this tree in the wild.

How to identify it

1. Examine the leaves: Look for long, narrow, pointed leaves, usually several times longer than they are wide. They are typically around 5–10 cm long, although size varies.
2. Check the underside: Turn a leaf over. The underside should appear noticeably paler, often silvery-grey, because of its fine silky hairs. This is one of the most useful identifying features.
3. Look at the upper surface and edges: The upper surface is generally dull green, sometimes with fine hairs. The leaf margins have small, fine teeth rather than a smooth edge.
4. Inspect the mature bark: Older trees develop grey-brown bark with deep, rough fissures. Young stems and branches look much smoother, so bark changes with age.
5. Observe the overall shape: White willow can grow into a large tree, often with ascending branches and a broad or irregular crown. Some individuals lean, especially beside waterways.
6. Study the young twigs: Young shoots are slender and flexible, commonly grey-brown and sometimes silky when young. Colour varies between individual trees and cultivated forms.
7. Look for spring catkins: Catkins appear around the time the leaves emerge. Male catkins often become yellow as pollen develops, while female catkins are generally greener. Male and female flowers grow on separate trees.
8. Check the habitat: Look beside rivers and streams, around lakes, on floodplains and in wet woodland. White willow is particularly associated with damp ground.
9. Examine the winter buds: In winter, look for narrow buds pressed close to the twig. They can be greenish to yellow-brown and hairy, but bud features can be difficult to interpret without experience.
10. Confirm the combination of features: Use the narrow, silvery-backed leaves alongside the bark, twigs, growth habit and habitat. Do not rely on a single feature: willows hybridise readily, making some trees difficult to identify conclusively.

Lookalikes

• Crack willow (Salix euxina, often listed under Salix fragilis in older references): Can grow in similar waterside habitats. Its leaves are generally less persistently silvery beneath, and its young branches can break away readily at their bases.
• Grey willow (Salix cinerea): Usually a smaller tree or shrub with broader leaves, often with a greyish, hairy underside.
• Goat willow (Salix caprea): Has much broader, oval leaves, making it noticeably different from the long, narrow leaves of white willow.
• Common osier (Salix viminalis): Has very long, narrow leaves and flexible shoots, so leaf shape alone can cause confusion. The overall leaf surface, growth habit and other features need checking.