Can you mail cannabis seeds through USPS? Without a DEA registration, only seeds meeting the federal hemp definition, and only within the United States. Publication 52, section 453.37, lets hemp travel in domestic mail when the mailer complies with federal, state and local law and keeps compliance records for at least three years. International mail is closed to hemp.
Updated 16 October 2026: new title and summary; first FAQ question reworded.
What does USPS Publication 52 say about mailing cannabis seeds?
As read here, section 453.37 never names seeds. It names hemp, and borrows the definition from federal law: 7 U.S.C. 1639o “or any successor provision”. That statute currently counts “the seeds thereof” as hemp, as this site’s reading of the statute set out. This desk read the current section 453.37 on the Postal Explorer page for Publication 52 and the Postal Bulletin 22579 notice that revised it, both on 23 September 2026. As a checklist:
| Section 453.37 condition | What it asks of the mailer |
|---|---|
| Product | Hemp or a hemp-based product at no more than 0.3 percent THC |
| Law | Compliance with federal, state and local law |
| Records | Lab results, licences or compliance reports kept at least 3 years after mailing |
| Destination | Domestic only; international mail, APO, FPO and DPO prohibited |
The records period and the international ban came with the bulletin, effective 26 August 2021. The bulletin printed the THC limit as “.03 percent” [sic]; the current Publication 52 page reads 0.3 percent, matching the statute.
What if the seeds are not hemp?
Section 453.31: if distributing a controlled substance is unlawful under the Controlled Substances Act, mailing it is also unlawful under 18 U.S.C. 1716. Controlled substances are accepted in domestic mail only when mailer and addressee are both DEA-registered or exempt from registration. An ordinary buyer ordering a packet fits neither.
Can you ship cannabis seeds across state lines?
As read here, section 453.37 draws no line between in-state and interstate mail. But the mailer must comply with state and local law, and the section publishes no state list, so the check sits with the sender and, at the other end, with you. Imports are another system: see this site’s customs-notice post.
Will cannabis seeds still be legal to ship after November 2026?
Because section 453.37 follows the federal definition “or any successor provision”, the mailing answer moves when the statute does. The 2025 amendment excludes viable seeds from a Cannabis sativa L. plant over 0.3 percent total THC. This site’s 19 September post gave 12 November 2026, the enacted date, without accounting for a delay.
Hemp Law Group, current as of 3 September 2026, reports the President signed H.R. 6500 on 2 September, moving most of the new definition to 11 December 2026. Only products with cannabinoids the plant cannot naturally produce keep 12 November. Everything else lands 11 December on its reading, which would include the seed exclusion. This desk has not read the enacted text of H.R. 6500, so treat 11 December as the likely seed date, not a settled one. The bills this site covered in August were separate.
Frequently asked questions
Are marijuana seeds illegal to ship?
Under Publication 52 section 453.37, hemp seed can go in domestic mail if the mailer follows federal, state and local law and keeps compliance records for three years. Viable seed that is not hemp is a controlled substance: section 453.31 treats mailing it as unlawful where distributing it is, and accepts controlled substances only between DEA-registered or exempt parties.
Can hemp seeds be mailed through USPS?
Yes, within the United States. Section 453.37 permits hemp and hemp-based products at no more than 0.3 percent THC in domestic mail when the mailer follows applicable law, and keeps lab results, licences or compliance reports for at least three years.
Can you mail seeds internationally?
Not hemp seeds through USPS. Since 26 August 2021 section 453.37 has prohibited hemp and hemp-based products in international mail, including APO, FPO and DPO addresses. Parcels arriving from abroad are a separate matter for U.S. Customs and Border Protection.
The standing instruction here outlives any bulletin: check your local laws before purchasing or germinating cannabis seeds. Section 453.37 decides whether a packet may travel, never whether the pot at the other end is lawful.