ROCK MULCH
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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