I've been growing Pulsatilla for about three years and love them. Until last year, I always deadheaded them. Last spring, I left the pretty seed heads on the plants. This spring, I have dozens of little Pulsatilla vulgaris plants flowering everywhere within 20 feet of the four parent plants! They went from seed to flowering in one year, so how can they be difficult to grow from seed? Beware those pretty seed heads!