What might this be?

Ilikeplants

Self seeded, maybe. 

B3

Looks like it could be elderberry.

Dovefromabove

Have you got any lovage that could have self seeded?
Or do you have ground elder in the garden?
or elder trees … Sambucus nigra?

Ilikeplants

This patch is where I had some huge conifers which was chopped down about 3 years ago now and the dry ground there is getting better. I’m trying to grow squash there this year. 

So I remember this plant popped up last year and I got impatient and did pull it up but it’s appeared again this year along with what looks like tiny rose leaves. I don’t think it’s lovage which looks like celery? Not sure about elderberry (though it does have 3 segments to a leaf) or ground elder... I don’t have ground elder anywhere else.

Ilikeplants

On second check of young plants I think you both might be right with elderberry https://treegrowing.tcv.org.uk/grow/tree-recipes/elder

So should it stay or should it go? Looks like about 2 seedlings there.

Besides the current squash trial, I’ve also got blackcurrant there.

Dovefromabove

Dig it out. You don’t want elderberry amongst your veg and fruit bushes. In that situation it’s a weed. 

Ilikeplants

o thanks @Dovefromabove, maybe I should transplant it to the back wild area? Near the pear trees that have never fruited for me in almost 10 years, where I can’t kill off the old snowberry hedge so just keep trying to cut it.

Dovefromabove

I expect there’ll be some already in the wild area or there soon will be … courtesy of the blackbirds. 😉 

Ilikeplants

Promptly removed towards the back. Maybe I’ll get elderberry next year and can always chop it back if I don’t like it. Those cheeky birds. Thanks for your help @Dovefromabove