I have not seen this one before Hogweed - it is exquisite, so dainty. I have a few new ones flowering this year - all grown from seed - some of which I got from friendly folk on this forum. I have Spring Magic and Grannies Bonnets to name just two. Where did you get your seed from?
Bought it last year as a plug from SR. Grew it on and planted it out mid summer. Didn't think they would come through all our snow but they did. I must check and see if the seeds are fertile (just checked and they are - bonus) but RHS do say it is a short-lived perennial. I will let one of the plants set seed and try.
'Optimism is the faith that leads to achievement' - Helen Keller
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In the sticks near Peterborough