Posted: 14/04/2014 at 10:12
You need to wait til it's totally ready to fly. Then grab it. You could put a paper bag over the head to catch it (not polythene) Sow some straight away, it might germinate very quickly when fresh. or dry and save and sow outside in autumn and it will germinate in spring. Some gritty compost in pots and cover with grit. Don't sow too early in autumn or it may still germinate quickly then you have babies to see through the winter.
It will be a year or two before you get flowers. They're corms. Corms and bulbs always take a few years to get to flowering size.
I should say that this is extrapolating from other anemones, I've never grown de caen