It looks very much like Salix caprea, aka Goat Willow, the fluffy seeds of which get blown everywhere and seem to especially like neglected pots. I get them popping-up in my blueberry pots.
A trowel in the hand is worth a thousand lost under a bush.
Thank you! A goat willow had never crossed my mind. What would be the issue of planting it out Hostafan1? I know nothing about willows so will read up this evening.
It's a thug, grows very big very quickly and saps water and nutrients from the soil. No redeeming features in form, foliage, flowers, colour, perfume..........
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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I'd remove it ASAP