John Farr has it right on,
there are other posts on this topic if you do a search.
I've got wood mulch, but I like spending time in the yard.
I refresh the mulch twice a year,
wood is cooler in summer, warmer in winter for cover near the plants,
it retains moisture better, and decomposes into food,
it IS the better way to go, in my opinion,
that said,,, rock (or rubber ) is once and done,
if you don't want to fool with it all.
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