That’s an ash tree seedling ... it’ll grow into a huge (and I mean huge) tree if you don’t remove it ASAP. Look around ... you’ve probably got a large ash tree within 500m ... and learn to recognise the tiny seedlings and pull them out before they get as big as that one which is a few years old.
Posts
https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/british-trees/a-z-of-british-trees/ash/
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
enjoy your garden
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.