The distinction reflects differences in processing method, energy input, and resulting product quality. Dehydrated alfalfa is artificially dried at high temperatures, yielding a more consistent nutrient profile and lower moisture content, while sun-cured product relies on field drying. These differences affect both commercial value and, in some cases, applicable duty rates, making accurate documentation of the drying method essential for correct classification.

USDA APHIS may require a phytosanitary certificate for processed plant-based feed products depending on origin and pest-risk status. Importers should also verify whether the product requires an APHIS permit, particularly when sourcing from countries with known alfalfa pest or disease concerns. Consulting a licensed customs broker and APHIS import specialists before the first shipment is advisable.