Willow is an introduced, deciduous tree which grows up to 12 m tall. It is
instantly recognised by its slender 'weeping', golden-yellow twigs. The bark is
greyish-brown, deeply and coursely fissured. It is widely planted for ornament
on river banks, pond margins and in parks and gardens.
Male and female flowers are in catkins which appear with the leaves on separate trees (dioecious) in April.
The catkins are 3-4 cm long. The male catkins have pale yellow scales and yellow anthers.
The female catkins are also yellow. The flowers have very short indistinct styles.