I haven't noticed any reseeding from my liatris. I'm in metro ATL, and it does come back each year. It is a clumping perennial for me. After just a few years, I have a couple of good sized clumps (read "big"). If your's don't come back, I'd be happy to share a piece. :)

Mine doesn't reseed, but it is perennial.

I have had a clump of Liatris pycnostachya - Prairie Blazing Star, for more than 25 years and have never found a seedling from it. I surmised that the birds were picking it clean or maybe it was a sterile clone?
Anyway, I'm rather pleased that it is not one of those plants that seeds all over the place, like my native Aster!
Rb

those things that are left on it, the fuzzy things, thats the "seeds". i just pull them off and set them free or trade them. LOL