Re: Dragon Fruit
If you have one plant planted in each 25 gallon pot, I would not worry about the pots getting too hot. If you have multiple plants, thereby some closer to the edge of the pot, you might want to whitewash them (I sprayed the Surround product I mentioned earlier on some of my potted citrus) but the darker color can be beneficial in cooler seasons. Hanging white fabric around the sunny side of the pots can also be effective. Roots of pitaya don't get very large so a plant in the center of the pot should be fine.
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