I really doubt there's a termite issue, millions of homes in the US use them.
If you were concerned you could use Cypress chips they are bug proof.
IMO chips look the best, and as they break down they add beneficial nutrients to the soil ie: roof of your plants/trees.
Stone does nothing, in fact some say they can over heat the roots & plants.
The chips can be raked to turn over once a year and look fresh.
Add new every 2-3 years.
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