IMHO, talk to the master gardener, Pinellas Library Fridays 9a to 3p. In general stone is not considered to be good. Now having stated this, you will find, and there will be LOTS of comments from people that have done this with no problems. If you talk to master gardener they will give the information you need to make an informed decision. I would suggest that you take photos of your existing plants with you, as you may find these may not be compatible with the heat generated by the stones.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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