Peat can carry soil organisms and plant material, so USDA APHIS may require phytosanitary documentation or inspection depending on the origin country and the presence of plant debris. Importers should verify current APHIS requirements for the specific country of origin before shipment, as conditions of entry can vary.

Peat litter refers to peat used as animal bedding, typically in a coarser, more absorbent form, whereas horticultural peat is processed for growing media. Both fall under the same subheading 270300, so the distinction does not affect tariff classification but may matter for end-use documentation or agricultural program eligibility.