Does white rocks help with moisture?

A customer has a question (which is actually the title) and I hope we can get some opinions on it, thanks

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Iā€™m not sure what the color of rock has to do with it

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I think what the customer is asking, is whether white colored rock might reflect light better than a say black rocks. Therefore keeping evaporation down.

Perlite or vermiculite will aid in aeration and moisture control in soil. Add some to dense soil for better drainage.