I noticed the same thing with Heucheras and I'm in zone 5. It's not the winters here that do them in but the summers. I think I've killed 7 or 8 (at least) and won't buy them (especially at current high prices) unless I've researched their parentage. A kind person over at DG recommended a nursery specializing in Heucheras better suited to hot summers with the nursery acknowledging that a lot of gardeners have issues with certain Heucheras.
So no avocados in AL. Didn't realize they need drier air.
