Dividing NE Aster
I've got a big, old New England Aster (Aster [or whatever it is now] novae-angliae) that needs dividing, but I tried to put my sharp spade into it, and it sort of bounced off. What's the best method for dividing it? I can probably dig the whole thing out, but what then? I'm trying to avoid being too destructive, since the new growth is already coming up from the base.