I have a few of these plants that have cropped up from somewhere ...
Never had them in the garden before and have no idea what they are - can some please help and advise me if they should be removed?
It could be one of the Euphorbia family.
Its Euphorbia lathyris a wild Euphorbia Up to you whether to remove or not. Can look pretty in the right location.
or a willowherb
Thank you Addict - Spot on!!!! Great help.
those euphorbias keep coming round. It's an epidemic
Definitely Euphorbia lathyris.
It has white milky sap.
Be very careful the sap is toxic. See...