In general if you buy from a nursery, be prepared to treat it as if it has mites or bugs or fungus in it as precaution since it is entirely possible from there. Might only be wood mites, but better to not have any bugs than worry if the bugs you see are snake mites or ticks.
You can bake at low temp (like 200-250F) for an hour or so, or freeze for 1 or 2 weeks to kill that sort of thing and it should be safe after.
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