I have the standard white Japanese anenome 'Honorine Jobert' and in the back garden I finally resorted to Round Up as it had spread so much. I noticed today it is still putting up new shoots! Shoot! ; ) But a couple years ago on vacation at Pismo I saw a double flowered one and the nice hotel people let me take a bit. I like this one so much better, and the flowers are lasting well in water, which the other ones never did. I do not know the name of this one. This is the first year it has flowered.