yes pinch off the flowers , thats what I would do let the plant put the energy into foliage , I think this is a tall growing variety amazing flowers great choice ...

Gg

Hi, that's what I would do, it's a bit early for them to be flowering, uually early summer, not early spring, Derek.

in the greenhouse has brought them on early ...

At the very least, cut the flowers off when you set them out. That will allow them to establish much more quickly, and multiply later bloom.

Thanks very much Gnarly, Derek and Tug - you've confirmed what I thought would be best. Yes, early, but my wooden greenhouse is very cosy!