Carolyn ....
I haven't purchased anything, yet. I am still in the planning stage because it is too cold to plant up here. Although, with the drought we are having in California, I may not plant any new plants this year.
I've read that heucheras are short lived plants, but I don't know how true that may be. From your statement above, I am guessing it varies by plant cultivar.
When I have specific plants chosen, I'll ask again.
Smiles,
Lyn