Sumter County extension agents and master gardeners at various meetings (Garden Club and Twice on Tuesday, etc) all recommend avoiding stone and lava rock - gets too hot. Stresses the plants.
They said, to paraphrase, that if you "have" to use it (or already have it), to not put it right up to the base of the plants but to leave a buffer of natural mulch (wood chips, etc) for a few inches around the base of each plant.
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