I have hall's hardy, mission and non pariel almonds in my orchard that have been growing nicely for me. They are about 4 years old now and a few put on blooms last spring. When it got really hot this summer (+/-100F) they dropped most of their leaves and just survived. I increased their water and that seemed to help some, but not all. The leaves were green, no chlorosis. The weather is cooling now, so I'm hoping they will recover.
I know some of you are in Cali and probably close to the surviving orchards there. Do they hold up to high heat for months there if they get enough water?
Thanks, D