I have to laugh about landscape rock overheating the soil around the plants. We just moved here from Southern AZ, Tucson to be exact, and it gets very hot there... Pretty much 4 months where it is over 100 degres almost every day. With alot of direct sunshine, most, if not all yards there have rock, and the plants survive just fine, as long as they get daily water. I suspect that the rock vs mulch/pine needles etc debate is mostly based on personal preference.
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