Some things I have done:
This is the solution.Simplest solution--wet down some white, or light colored, sheets/t-shirts/towels, etc. -- I use spare reusable pee pads I've got around for my dog.-- Put them over the pots IN THE MORNING just after you water the trees...I've been using this method for years here in Va.--where summers are a lot hotter than up North. Works very well.
Don't laugh at the pee pads. (they've not been used by the dog--if you're wondering). They insulate the morning cool in the pot and prevent a lot of evaporation from the soil's surface too. The trees they're on remain in full sun all day, pots remain cool all day...
Black containers attract heat worse than lighter colors so use that to your advantage of course. Thin plastic of any color cannot compete with the insulation of wooden boxes (also, in-addition to keeping temps down on a hot day, a wooden box dramatically *slows* temp-changes and, while true-temp is of course a big concern, the speed-of-change in temp can be shocking to sensitive plants so the wood provides a buffer in that way as well!)
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