Cannabis seeds and clones are legal to buy under federal law because they contain 0.3% or less delta-9 THC and therefore qualify as hemp, but the legal status of cannabis seeds and clones changes the moment you grow a plant that crosses that THC line. At that point federal law treats the plant as marijuana, and whether you can lawfully cultivate it depends entirely on your state. Most legalization states allow home growing under plant-count limits; a smaller number still treat any cultivation as a crime.
Why Seeds and Clones Qualify as Hemp
The Agriculture Improvement Act of 2018 drew the line between hemp and marijuana by chemistry alone. Hemp is any part of the cannabis plant, including seeds and derivatives, with a delta-9 THC concentration of no more than 0.3 percent on a dry weight basis.1Office of the Law Revision Counsel. 7 USC 1639o – Definitions Anything below that line was removed from the Controlled Substances Act’s definition of marijuana.2Federal Register. Implementation of the Agriculture Improvement Act of 2018
Cannabis seeds almost never contain meaningful levels of THC, and in early 2022 the Drug Enforcement Administration confirmed this in a letter to attorney Shane Pennington. The agency’s Drug and Chemical Evaluation Section stated that any seed, tissue culture, or other genetic material at or below 0.3 percent delta-9 THC meets the definition of hemp and is not controlled under the CSA. A substantially similar letter went to another law firm later that year. Federal law evaluates the material’s chemistry at the time of sale or transit, not what the plant might eventually produce.
That interpretation is what lets seed banks and nurseries ship cannabis genetics across state lines. In transit, the seeds and cuttings are hemp. The legal status changes only if a growing plant crosses the 0.3 percent THC threshold.
Buying Is Legal, Growing High-THC Plants Is Not
This is where buyers get caught out. Purchasing cannabis seeds is federally legal. Cultivating marijuana plants from those seeds is a federal crime. The DEA’s 2022 letter said as much: if a seed germinates into material with THC above 0.3 percent, that material is Schedule I marijuana. Federal cultivation penalties under 21 U.S.C. ยง 841 can reach five years in prison for fewer than 50 plants and escalate sharply from there.3Office of the Law Revision Counsel. 21 USC 841 – Prohibited Acts A
In practice, federal prosecutors have largely left small home grows alone in states where cultivation is legal. That restraint is a policy choice, not a legal protection, and it can shift with a new administration. If you grow in a state that allows it, your real shield is state law.
State Home Cultivation Rules
Federal law governs whether seeds and clones can be sold and shipped. State law governs whether you can plant them. Among the 24 states that have legalized recreational cannabis, 20 allow adults to grow at home. Among the broader group of 40 states with medical cannabis programs, 25 permit some form of patient cultivation. Everywhere else, putting a seed in soil can bring criminal charges.
Where home cultivation is allowed, the most common cap is six plants per person and twelve per household, though details vary:
- Typical adult-use limit: six plants per person with a household cap of twelve, often splitting mature (flowering) from immature plants.
- Lower-limit states cap personal grows at two to four plants with proportionally lower household maximums.
- Medical programs sometimes allow higher counts than recreational rules and occasionally tie the number to medical need rather than a fixed cap.
In prohibition states, possessing a germinated seed or rooted clone can lead to misdemeanor or felony charges depending on quantity, with penalties ranging from civil fines to jail. Medical-only states usually restrict growing to registered patients and require a state-issued card tied to an approved condition. Growing without proper enrollment carries the same penalties as unlicensed cultivation.
How Buying and Shipping Actually Work
Documentation and Age
Whether you’re buying in person or online, you’ll need a valid government-issued photo ID showing you’re at least 21. Dispensaries record that information to protect their license. Medical buyers also need their state-issued registry card or recommendation, which dispensaries typically verify against a state database. Online seed banks selling under the federal hemp framework often have lighter requirements, sometimes just age verification and a shipping address.
Payment Is Often Awkward
Many banks and mainstream processors still treat hemp seed transactions as high-risk and lump them in with all cannabis products, so declined cards and frozen accounts are common even for fully compliant sellers. Seed banks work around this with bank transfers, money orders, cashier’s checks, and sometimes cryptocurrency. Dispensaries selling clones often run cash-only or debit-only. When a seed bank does offer credit card checkout, it’s usually running through a specialized hemp-underwritten payment gateway rather than a standard processor.
Domestic Shipping
Because seeds and clones at or below 0.3 percent THC qualify as hemp, they can legally move through domestic mail. The U.S. Postal Service permits mailing hemp products when the mailer complies with all applicable federal, state, and local laws, including USDA-approved plans under 7 CFR Part 990, and retains compliance records for at least three years after mailing.4United States Postal Service. Publication 52 Revision – Hemp-based Products Update Seeds ship in padded envelopes or small boxes. Clones need breathable containers, moisture control, and expedited delivery, which typically adds $20 to $50 to an order depending on speed. UPS and FedEx also ship hemp, though their internal policies can be stricter than USPS rules.
International mail is a different story. The USPS flatly prohibits shipping hemp products in international mail, including to APO, FPO, and DPO addresses.4United States Postal Service. Publication 52 Revision – Hemp-based Products Update You cannot mail seeds or clones out of the country through the Postal Service, even to destinations where cannabis is legal.
Choosing a Vendor
A licensed dispensary is the safest source for clones because these operations are state-regulated and subject to inspection. For online seed purchases, verify the vendor’s hemp license or business registration through public records where you can. Reputable seed banks offer germination guarantees, label genetics clearly, and ship with tracking, often requiring an adult signature at delivery. Inspect what arrives immediately. Genetic labels should match your order, and clones should show no wilting, mold, or pest damage.
A Definition Change Coming in November 2026
The FY2026 Agriculture Appropriations Act (P.L. 119-37) amends the statutory definition of hemp. Starting November 12, 2026, the legal threshold shifts from delta-9 THC alone to total THC, which includes tetrahydrocannabinolic acid (THCA) in the calculation.5Congress.gov. Changes to the Statutory Definition of Hemp and Issues for Congress The new definition covers Cannabis sativa L. and any part of the plant with a total THC concentration, including THCA, of not more than 0.3 percent on a dry weight basis.
For seeds and unrooted clones the change is unlikely to matter, since those materials contain negligible amounts of either compound. But the new law also explicitly excludes “viable seeds from a cannabis plant that exceed a total THC concentration, including THCA, of 0.3% on a dry weight basis,” which could affect certain seed stock over time.5Congress.gov. Changes to the Statutory Definition of Hemp and Issues for Congress The USDA has already been requiring labs to test for total THC when analyzing hemp crop samples, so the statute is catching up to how testing works in practice.6U.S. Department of Agriculture, Agricultural Marketing Service. Laboratory Testing Guidelines U.S. Domestic Hemp Production Until November 2026, the 2018 Farm Bill’s delta-9-only definition remains controlling law.1Office of the Law Revision Counsel. 7 USC 1639o – Definitions
Watch for Licensed Genetics
Some seeds and clones come with legal strings. Breeders can obtain federal Plant Variety Protection certificates for new and distinct Cannabis sativa varieties as long as THC stays below 0.3 percent. Utility patents cover novel plant traits and cannabis-related agricultural technology, and plant patents can protect specific asexually reproduced varieties, which is directly relevant to clones.
In practice, some genetics you buy are governed by licensing agreements that restrict what you can do with them. A typical agreement prohibits propagating or breeding the material, transferring seeds or cuttings to anyone else, and conducting research beyond basic yield testing for personal use. Violations can trigger termination of the license, court-ordered destruction of the genetics, and liability for the breeder’s legal costs.7U.S. Securities and Exchange Commission. License and Packaging Agreement (Exhibit 1A-6C) Most home growers buying a few seeds from a seed bank won’t run into any of this. Anyone buying named varieties from a commercial breeding program should read the fine print before cloning a mother plant or handing cuttings to a friend.