Plant in need of ID
I was telling Nut yesterday about this plant that has appeared in the garden - it appeared last year and possibly the year before, but in an area which was meant to be lawn, so got mowed.
This year the lawn is no longer there, it's now the little wilderness behind the new pond and the plant has appeared again.
Feathery carrot-like foliage but softer, and growth like an umbellifer but not one I recognise - round stem. We've marshes nearby so I did wonder about Water Dropwort, but I think the leaves are too finely divided for that.
The gardener-before-last at this address seems to have been a 'proper gardener' so it might be an interesting cultivated plant - or it might be from wild bird seed - or ............... anyone got any ideas?