Posted: 27/10/2013 at 20:15
If they look dry, give them a soak and plant. If you have some protection such as a cold frame, I would put them in there (in a pot)for the winter, and then in their final position in spring. If you dont, then get them in final position. Leaving a root to dry out even further will probably mean it will take a number of years to get going.
Japanese anemones are totally different from anemone blanda and de caen, which come from corms. What you have there is a rootstock for a perennial plant.