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What are some low-maintenance useful (edible) plants I can grow in (Phoenix) Arizona that aren't just herbs? I don't mean something that I can plant in the middle of the desert and leave it alone, but I don't want the plant to die if I forget to water it at exactly the same time every day or some such. I've got 3 citrus trees in my yard which can provide plenty of shade while still letting light through, if it makes a difference.