Thanks Pam for this thread.
I love wallflowers, one of the first plants that I grew from seed, so easy to germinate and to grow on. Great for insects and lovely scent. Atlhough traditionally known as a spring flowering plant, I have had them flowering throughout the summer and now, I don't mean the Bowles Mauve ones ( although I have a couple of those as well)
I'm still learning with the perinnial types- I've been dead heading sporadically over the summer and I have fed them a little too.
Lokelani -mine have also been absolutley brilliant this year. More of a shrub then a plant. They are meant to be very easy to take cuttings of ..........something I should have got around to doing but haven't, maybe next year. I think they maybe alright for a 2nd year. I think trust your instincts, just deadhead and see what happens. They are meant to be hardy, good luck with the cuttings, I have left it too late now, but I do know what you mean about them still being full of flowers. Like Gary I 've seen butterflies on them last weekend.
For those who have the space outside- I think that growing from seed is the very best way to get loads of healthy bushy plants very cheaply. Just prick out the growing tips after the you have a few sets of true leaves and they are off