You should be careful using lava rocks as mulch. They shouldn't be used
anywhere you want tender plants to grow. The rocks tend to cut the stems as
they move around, especially if you walk on them. They also attract sun, so
they get quite hot. If you do decide to use them for anything, remember to
put plastic or similar underneath, so they don't sink into the ground. Try
newspaper, leaves, dry grass clippings, or compost as mulch.
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