The trick to keeping temps down under shade cloth is to keep the cloth damp. It acts like its own natural swamp cooler. Set up an intermittent sprayer for the cloth or attach a drip hose to the tops of the sides and run it on a timer. If not done on a timer you will end up growing a bit of algae. It works. I'm in the mojave and it's the only way I can grow in the hottest months.
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