Two species of willow, Goat Willow and Grey Willow, are so similar that we usually lump them together and call them Sallow or, in spring, Pussy Willow.
The male flowers dropped off weeks ago and now the female flowers have developed into fluffy seed heads. The fluff helps the seed to sail away on the wind and find somewhere new to grow but many of the seed heads fall on to the ground, looking like furry caterpillars.
This helps you to locate the sallow tree.
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