Yes, you can send seeds in the mail. Domestic shipments between gardeners in the lower 48 states are legal as long as the seeds aren’t on a prohibited species list, the package is marked on the outside to identify its contents, and the seeds are clean of soil and plant debris. The rules tighten considerably for shipments to Hawaii and U.S. territories, for exports, and for anyone selling seeds commercially.
Mailing Seeds Between States
USPS treats seeds as plant products, and they are mailable within the United States, its territories, and possessions as long as they comply with federal agricultural statutes.1Postal Explorer. Publication 52 – Hazardous, Restricted, and Perishable Mail For a casual seed swap, three things matter: packaging that won’t spill, seeds free of soil and debris, and no prohibited species inside.
The federal Terminal Inspection Act requires that any package containing plant material carry an exterior marking identifying the contents, along with the sender’s and recipient’s names and addresses, in a form that won’t smear or wash off.2USPS. Prohibitions and Restrictions on Mailing Plants, Animals, and Related Matter That marking is what allows agricultural inspectors to identify shipments heading to states with plant inspection programs.
States can add their own restrictions. Under the Plant Protection Act, state rules must be consistent with federal ones unless the state has shown the USDA a special need for stricter requirements.3eCFR. 7 CFR Part 360 – Noxious Weed Regulations Before you ship across state lines, check both the federal noxious weed list and the recipient state’s restricted species list.
Seeds You Cannot Mail
Some seeds are banned regardless of packaging or destination.
Federal noxious weeds top the list. The USDA Administrator designates specific plant species as noxious to prevent their spread, and the list includes giant hogweed, cogongrass, dodder, and various wild rice species.4eCFR. 7 CFR 360.200 – Designation of Noxious Weeds Moving those seeds in interstate commerce without a USDA permit is illegal.
Marijuana seeds are prohibited from the mail entirely, whether medical or otherwise, though hemp and CBD products are allowed with restrictions.5USPS. Shipping Restrictions and HAZMAT – What Can You Send in the Mail
Seeds of species listed in CITES Appendix I need valid CITES documents for any international shipment, and Appendix II and III species may need documentation too, depending on annotations.6eCFR. 50 CFR Part 23 – Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) For protected plant seeds you may need clearance from both APHIS and the U.S. Fish and Wildlife Service.
Shipping Seeds to Hawaii and U.S. Territories
Mailing seeds from the mainland to Hawaii, Puerto Rico, Guam, or other territories is technically domestic, but the agricultural inspection rules are much stricter than mainland state-to-state shipping. Hawaii runs aggressive inspection because its island ecosystem is vulnerable to invasive species.
Packages containing seeds shipped to Hawaii must be marked on the outside with language such as “Contains Agricultural Material — May Be Opened for Inspection” and include a manifest listing the plant material inside. All seeds must be free of soil, insect pests, and signs of disease. Some seeds, including pineapple, passion fruit, and coffee, cannot be imported into Hawaii without prior permits, quarantine arrangements, or certification. Skip those steps and expect the package to be opened on arrival, with contents potentially confiscated and destroyed.
Mailing Seeds Out of the United States
Exporting seeds requires a phytosanitary certificate confirming the seeds were inspected and found free of harmful pests and diseases. APHIS issues these through its Phytosanitary Certificate Issuance and Tracking (PCIT) system.7Animal and Plant Health Inspection Service. Plant and Plant Product Exports
Fees depend on shipment value. A commercial shipment worth $1,250 or more costs $106. A non-commercial shipment under $1,250 costs $61. If a state or county inspector issues the certificate on behalf of APHIS, you’ll pay a $6 administrative fee to APHIS plus the state or county’s charge.8Animal and Plant Health Inspection Service. User Fees for Export Certification of Plants and Plant Products
You’ll also need a customs declaration that accurately identifies the contents, including the scientific name of the seeds. Every destination country then sets its own import rules. Some require the recipient to obtain an import permit before the seeds cross the border. Others ban certain seed types entirely, no matter what certificates you carry. Confirm the destination country’s requirements before you ship or the package can be seized at the other end.
Receiving Seeds From Another Country
Seeds coming into the U.S. trigger APHIS import regulations. Agricultural and vegetable crop seeds regulated under the Federal Seed Act require a phytosanitary certificate from the country of origin, plus a declaration from the importer stating the kind, variety, origin, and intended use of each seed lot. Some seeds carry extra requirements. Tomato and pepper seeds from any country, for example, must be tested for virus and viroid diseases and arrive with a phytosanitary certificate carrying specific additional declarations.9Animal and Plant Health Inspection Service. Seeds With Special Requirements and Prohibited Seeds
Travelers entering the country must declare seeds on the CBP Declaration Form for inspection at the port of entry.10U.S. Customs and Border Protection. Bringing Agricultural Products Into the United States Seeds arriving by mail get the same inspection. Without proper documentation, inspectors can seize and destroy them or require re-export at your expense.
The Small Lots of Seed Program
APHIS runs a Small Lots of Seed program that simplifies imports of small quantities. Instead of a phytosanitary certificate, you need only a PPQ 587 import permit, applied for online through the APHIS eFile system.11APHIS. APHIS eFile – Home To qualify, the shipment must contain no more than 50 seeds or 10 grams of a single species per packet, and no more than 50 packets total. Seeds cannot be a federal noxious weed, a parasitic plant, or a species listed as “Not Authorized Pending Pest Risk Analysis.” They can’t be pelleted, coated, embedded in growing media, or arranged on seed tape. They must be untreated and pesticide-free. Each packet has to show the seller’s name, the plant’s scientific name, and the country of origin. And the shipment has to go to the APHIS Plant Inspection Station listed on your permit using a green and yellow shipping label.9Animal and Plant Health Inspection Service. Seeds With Special Requirements and Prohibited Seeds
Tomato and pepper seeds are excluded from the Small Lots program entirely and always require the full phytosanitary certificate with additional declarations, even in tiny quantities.
Selling Seeds Instead of Swapping Them
Commercial seed sales are a different situation. The Federal Seed Act imposes detailed labeling requirements for agricultural and vegetable seeds shipped in interstate commerce. Every container must show the seed variety name, lot number, origin (where the seed was grown), percentage of weed seeds including any noxious weed seeds, germination rate, and percentage of inert matter. The label must also show the month and year the germination test was performed.12Office of the Law Revision Counsel. 7 USC 1571 – Prohibitions Relating to Interstate Commerce in Certain Seeds
Chemically treated seeds carry extra requirements. The label must name the treatment substance and, for chemicals that could be harmful if ingested, carry a warning such as “Do not use for food, feed, or oil purposes.”13Agricultural Marketing Service. Labeling Requirements for Chemically Treated Seed
Mailing a packet of heirloom tomato seeds to a gardening friend doesn’t put you under the Federal Seed Act’s labeling regime. Running even a small online seed shop does.
Penalties for Getting It Wrong
Federal Seed Act violations, mostly labeling and documentation failures on commercial sales, carry civil penalties between $122 and $2,449 per violation.14eCFR. 7 CFR 3.91 – Adjusted Civil Monetary Penalties
The Plant Protection Act hits harder. Civil fines for individuals can reach $50,000 per violation, though a first-time violation by someone moving seeds without monetary gain is capped at $1,000. Businesses and other entities face fines up to $250,000 per violation, with a ceiling of $1,000,000 for all violations in a single proceeding if any were willful.15Office of the Law Revision Counsel. 7 USC 7734 – Penalties for Violation
Criminal penalties are where people tend to underestimate the risk. Knowingly violating the Plant Protection Act can mean up to one year in prison. If you knowingly import, export, or move regulated plant material for distribution or sale in violation of the Act, the maximum climbs to five years. A second conviction can bring up to ten.15Office of the Law Revision Counsel. 7 USC 7734 – Penalties for Violation APHIS actively investigates unauthorized seed imports, especially those involving noxious weeds or agricultural pests.
If Seeds Arrive in the Mail You Didn’t Order
Do not plant them. The USDA has been clear on this since a wave of unsolicited seed packages arrived from foreign countries in 2020. Seeds of unknown origin could carry invasive pests, plant diseases, or noxious weed species capable of damaging local agriculture and ecosystems.
Report the package to your state department of agriculture or to APHIS. If you need to dispose of the seeds yourself, USDA guidance is dry heat: bake the seeds at 325°F for 30 minutes on a foil-lined pan, let them cool, then double-bag them in plastic and throw them away along with the original packaging. Don’t compost them, and don’t dump them outdoors where they might germinate.