319.37-9—Approved packing material.
Any restricted article at the time of importation or offer for importation into the United States shall not be packed in a packing material unless the plants were packed in the packing material immediately prior to shipment; such packing material is free from sand, soil, or earth (except for sand designated below); has not been used previously as packing material or otherwise; and is listed below:
Baked or expanded clay pellets.
Buckwheat hulls.
Coral sand from Bermuda, if the article packed in such sand is accompanied by a phytosanitary certificate of inspection containing an accurate additional declaration from the plant protection service of Bermuda that such sand was free from soil.
Excelsior.
Exfoliated vermiculite.
Ground cork.
Ground peat.
Ground rubber.
Paper.
Perlite.
Polymer stabilized cellulose.
Quarry gravel.
Rock wool.
Sawdust.
Shavings—wood or cork.
Sphagnum moss.
Stockosorb superabsorbent polymer
Vegetable fiber when free of pulp, including coconut fiber and Osmunda fiber, but excluding sugarcane fiber and cotton fiber.
Volcanic rock.