Rocks can be used as mulch in the landscape. Use river rock or pea gravel
to maintain a proper size and color in the landscape.
Avoid using ground limestone or marble. The cost of the former may be
ideal, though limestone (calcium carbonate) will alter the soil pH, resulting
in yellowing of evergreens and other plants. Marble is a metamorphic form
of limestone, which means it still is calcium carbonate and will raise
the pH, though much slower.
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