thanks for the answers. i was seriously about to pull it out when i remembered this post.
been a long time since I've been in the garden!

I don't think so. Never flowered.
I've kept one growing and it has just got taller at this point.

Thanks I'll play it safe and dispose of

We recently moved house and a number of random plants have popped up in our pots.

I can see what most are but I have two of these and I cant…