What is this pls?

[flatwhiteagain]

Does anyone know what plant this is pls? Pretty sure I didn't plant it but it's grown like crazy in the last couple of weeks! Thanks in advance

It looks like a wallflower to me. It's got buds on it so you'll soon find out.

Looks like Campanula Latiloba, flowers grow very upright. Either blue or white.

Had a look at the bud, so now not sure.

Thank you Wow and Bee. I think it could be a campanula - I may have bought one a few years back but it seems be growing really fast at the moment so I wondered if it was a weed!