Natalie ...
I agree that this would be important information for the database and is very important for gardeners.
The AHS A-Z Encyclopedia of Garden Plants, that you recommended that I purchase a while back, does give heat zones, but the problem with using it as a definite guide is that arid heat and humid heat are included in the same heat zone category.
Plants that will do well in humid heat zone 8 will fry in my arid heat zone 8.
I think the best I can manage is to look for plants for heat zone 9 or above.
Smiles,
Lyn
