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It looks like Himalayan Balsam as well.
Don't let it seed and hoe the seedlings off. But if it's on other allotments or growing wild nearby it will be impossible to eliminate. It is only and annual so once you've hoed one off that one is gone.
But I'll loose half the flowers if I cut back in winter
I've finally succeeded in getting one of these to survive and grow and it's going to flower.
Do I prune after flowering like R. sanguineum? and how hard?
Always worth a go I think.
Where are they now CB?
I never use heat Charlie. It discourages some seeds and only tropicals are likely to need it.
I set cerinthes in a pot of compost, not deeply buried, around March sometime, in the cold GH and wait
I've never soaked and they germinate well.
Thinks folks. I am a proud parent though I didn't do a lot. Paeonies are very easy to germinate. Fidget and landgirl gave me paeony seed as well last year and I expect action any time now.
Thank you, now all I have to do is keep them going
THEY HAVE GERMINATED
Only 2 so far but I expect more