Eh, this year we had over 60 days of 100F+ weather, with temps not going below 85 at night for a considerable portion of that. Even if I grow them in the shade of the porch they won't get flowers for a month at a time.

Ya I live in a very dry climate and the nights cool down and evapotranspiration cools a bunch, so maybe that's why it works so well.

I was very impressed with the material though. Complete game changer in my environment. I can grow all kinds of things through summer. Parsley, lettuce, I even had Brussels sprouts and rhubarb go through the heat this summer looking perky the whole time.