Does anyone know if there are cultivars that will survive in the Texas heat?
Hostas in Texas?
Most people that far south grow hostas in pots to help control the water issue. As for the heat, try hostas that are fragrant or bloom later in the season. They tend to be more heat tolerant. Some examples of fragrant hostas would be Guacamole, Fragrant Bouquet, and plantaginea.
When you grow hostas in the south you need the 'low chill' variey, they can make due with a short dormancy period. The purpose of the pots is to let more cold air get to the roots. Mine have done fine in the ground but I have a few in pots sitting under the trees. I figured if cold air gets to the roots then so would the heat but the ones in full shade do fine.
Here is a great article for anyone trying to grow Hostas in a warm climate, also a good list of Hostas that are low chill dormants.
Choose hostas that have plantaginea in them because Hosta plantaginea (Chinese species) requires no winter chill at all.
H. 'Abiqua Moonbeam'
That's a great list, Eleven. I grow Hostas although I am not that far south. I do grow some in pots. I am very interested in looking over that list of fragrant ones. :)