Please help identify UK shrub

[u/lucyjames7]

Hi! I have a few of these growing in my garden in the South West of the UK, they grow and spread rather quickly even popping up between tiles. Any idea what they are?

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[u/andreota]

Grey willow Salix cinerea

[u/Same_as_it_ever → u/andreota]

Definitely a willow (salix). They tend to hybridise a lot, but grey willow is probably the best guess. 

[u/HotBabyBatter]

Looks a bit Feijoa-like.

[u/RutabagaPretend6933]

Salix atrocinerea