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Using Pebbles as a Mulch in Succulent Garden

I have a thin strip in front of my home that we are redoing as a rock garden. I want to plant succulents into well-drained soil and then use a decorative pebble on top of this as a mulch layer. Since this area gets full Summer sun exposure in California Zone 9b, do I need to worry about the pebbles warming up the soil too much and potentially harming the roots of plants?

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