Tom, there isn't one yet that can take both the heat AND my neglect.
Maybe next year I will try Tiny Tuff Stuff in a container. I want the lacecaps rather than the mopheads, and blue rather than pink. Happy the selection there is growing.
Bonnie, the watering part--or rather lack of it--is the biggest reason they have all died.
Had a couple of real beauties that I might try again next year, one was all white and the other had variegated foliage.