Cindy ...
You are correct. The plants that are used in the breeding program that are adapted to hot, dry summers usually contain the species found in similar conditions.
I had to build my soil first before I could grow anything and now that the drought is over for my part of California, I am ready to experiment with edibles again. I didn't plant any new plants during the drought because they require more water to get established.
Smiles,
Lyn