Some categories of plants for planting are prohibited entry into the United States. These plants may only be imported into an APHIS-approved containment facility under a controlled import permit (PPQ 588–Permit to Import Prohibited Plants or Plant Products for research, development and therapeutic purposes).
Not Authorized Pending Pest Risk Analysis (NAPPRA) Plants is a category of regulated plants that cannot be imported into the United States until APHIS completes a pest risk analysis and puts mitigation measures in place. Small quantities of NAPPRA plants may be imported for experimental, therapeutic and development purposes under strict quarantine conditions with a controlled import permit (PPQ 588).
Some plant species from a few countries are exempt from the NAPPRA restrictions based on pest risk assessment and trade history. Please refer to APHIS’ Plants for Planting Manual or the NAPPRA site see the NAPPRA Lists section) to view lists of NAPPRA plants and country exemptions.
If you are importing a plant from a country for which there is a NAPPRA exemption, then you would need:
All propagatable plant parts of Federal Noxious Weeds are prohibited from all countries. These plants may only be imported for research in an APHIS-approved containment facility with a PPQ 526–Permit to Move Live Plant Pests, Biological Control Agents, or Noxious Weeds.