I've got these coming up all over a part of the border, any ideas?
edited May 2021
I'm pretty sure those are elderberry (Sambucus nigra) seedlings, probably a 'gift' from the birds. To be sure, rub a leaf and smell!
PS: if they don't smell strongly, they could be dahlia seedlings.
A trowel in the hand is worth a thousand lost under a bush.
They look like my Dahlias when they come up, mine aren't showing as yet though, maybe a bit early for them.
Must stop buying more plants, repeat, must stop buying....
. I think you might be right. There's a sambucus nigra at the back of the border. I need to oik them out then.
. I hate dahlias and I don't have any at all.
Sambucus it must be, never had that happen before.