Plant ID please
Can anybody identify this plant that I was given last year. It has a blue flower during Summer. Whilst this has filled a space, I’ve noticed it spreading to other parts of the border and I think it might become a bit thuggish.
It looks like one of the Campanulas; I bought a plant from a local nursery and it has completely taken over a bed, it is a real thug. Very pretty, if you can keep it under control, it spreads by underground rhizomes.