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Other things you guys may consider...
Lift the pots off the hot ground. A couple of sticks under the pots will accomplish this.
Shade the pots, not so much the leaves. Even a piece of plywood leaned against the pot can keep the sun from beating on the pots and heating the roots. Use some mulch on the top of the soil. Mulch can retain moisture and keep the sun from directly heating the soil and roots.
If growing in the ground, remember early in the season to water then let the soil dry on top so the roots go deep seeking moisture.
All solid points. Thank you. I have already raised the pots off the ground with paver stones, about 4". Creates a nice flow of air under the pot. The soil is covered with a layer of Hydroton. I considered wrapping the pots in burlap to shade them, but after taking the previous steps, my root temps are right at 70° in full sun and it wasn't necessary.