Ouch. That's Texas hot. How many tainers do you have? Maybe post this in a new thread for the Southern container growers to weigh in.
Haven't had that problem.
2 thoughts - start really early and also replant for a fall crop like the texans do. I wonder if that would work in NY?
What about putting down a layer of foam insulation board? If you can't get white you could also staple a layer of Tyvec house wrap to it. That would not be to expensive.
It would need to be wide enough to avoid having the radiant heat coming off the black roof still hitting the foliage.
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