Annual wallflowers, remove after flowering?
I grew my own wallflowers from seed and they have been fantastic. Now stopping flowering so should I remove them or just dead head hoping they will self seed?
If you deadhead, you'll be throwing the seeds away.
Have you any left in the packet?
In London. Keen but lazy.
No seed left over but (answering my own question!) leave one or two plants that are not in the way and hope they seed. Sorry should have thought of that before posting.
If you want to collect the seed, leave the old flowers on to form seed pods and collect them when they're ripe, then pull out the old plants if you need the space for something else. Wallflowers will sometimes flower for a second year if left in, but in my experience they tend to get a bit leggy and don't look as good as younger ones.