Answer: I'm sorry to say that it's six of one, half dozen of another on this issue! It's very stressful on plants to be transplanted in the midst of intense summer heat, but it's also stressful for their root systems to remain within black plastic nursery pots in the midst of summer. If they are still looking healthy in the pots, I'd wait until this extreme heat we are experiencing reduces a bit. It can't last forever, right? Prepare your holes before removing the plants from the pots, so roots aren't exposed to the air for any longer than necessary. Plant at the end of the day, so they don't have immediately intense sun. Most importantly, ensure that soil stays consistently moist, but not wet, throughout the remainder of summer. Finally, if possible, you might want to erect a temporary shade cover to give them a little relief. Good luck!
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