Hi Jo-Ann
It's not so clear cut as to say a tree which thrives in one environment won't grow in another. Most of my trees seem to do pretty good in the heat. I have been observing four which seem to struggle:
Marseillaise Black - This one is growing very slowly. It is 4 years old and other trees the same age are 3-4 times it's size. I have 1st year cuttings with more top growth on them than it does. Also. I only have two trees which seem to be struggling with leaf rust, this is one of them.
Osborne Prolific - Same as MBVS... short and covered in rust. I actually dug up some of the roots on this one to check for RKN today. It's clean.
Verdal Longue - I'm not sure if it is a heat issue or it just wallows in it's FMV. We'll see how it goes from here
Armenian - I posted about this tree a few days ago. It must have read it was potentially on the chopping block, then decided to start growing some fruit.
I'm not sure how many of the problems are due to heat and how many are due to other factors. There are other trees in the field which came to me from cooler climates which are outpacing LSU Purple and LSU Gold. If all else fails, take comfort in the fact that figs originated in the Mediterranean heat.
~james