rock seems to work great as noted above, and look around.
I use wood mulch.
The florida extension service suggests it as not stressing the plants as much (less heat and more water retained), and while it's a couple/few hours a year to replace, it's a lot less costly upfront. Also, it decomposes and feeds the plants. My landscaping looks great. Last, you can toss prunings etc onto the wood and it's no big deal, it decomposes too. It looks messier on the rock.
All just my opinion.
But, rocks are no maintenance, once and done.
And if I get where I don't want to fool with it, I might go that way.
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