i read a research paper a while back
they had used several different species (6 i think)
papaya and guava im pretty sure were 2 of them. i dont remember the rest...
The paper said there was a temp that the plants "peaked" at,
and anything over that temp, the plant slowed its growth.
that temp, if i remember rigfht, was around the mid 80s for most plants
There was a second point for most of the plants studied
in which , over that temp, it stopped growing all together.
if i remember right, the temps were very similar for most of the plants studied
it was in the mid 90s
I wish mango had been one of the plants, i would habve paid more attention
and saved the paper.
I use my hose when its hot, usually over 90
to spray the leaves of my plants.
Since my backyard is a bit of a jungle, that mist really cools things down
i can feel it.