Answer: Having personal experience with trial and error in the Phoenix area, I agree with your observations! The safest thing is to plant exotics (anything not native to Arizona) in a site that is protected from hot afternoon sunshine during June, July and August. If a plant tag says full sun, unless it is a palm, citrus, rose, or other heat lover, I give it morning sun and afternoon shade. This holds true for hibiscus, bird of paradise, gardenia, etc. Hope this helps!
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