We have been asked on numerous occasions whether hemp microgreens can be a viable alternative crop. There are implications for both growers and consumers.

In fact, on August 17, 2026, Congress.org reported as follows:

"Changes to the Definition of Hemp

The primary statutory definition of hemp after the enactment of P.L. 119-37, Division B, §781, with certain inclusions and exclusions, is to become, after November 12, 2026, the plant Cannabis sativa L. and any part of that plant, including the seeds thereof and all derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers, whether growing or not, with a total [THC] concentration (including tetrahydrocannabinolic acid [THCA]) of not more than 0.3 percent on a dry weight basis. (7 U.S.C. §1639o note)`

While the 2018 farm bill definition of hemp contains a limit of 0.3% delta-9 THC on a dry weight basis, the new hemp definition includes a total THC concentration. This change reflects the fact that delta-9 THC is not the only potentially intoxicating THC in the cannabis plant (e.g., delta-8 THC).

Inclusion of Industrial Hemp

The new hemp definition explicitly includes industrial hemp. Industrial hemp is defined in P.L. 119-37 as hemp grown for the use of the stalk, whole grain, oil, cake, nut, hull, or any other non-cannabinoid derivative of the seeds. It also includes hemp used for fiber or for immature plants (e.g., microgreens or other edible leaf products). Hemp that is grown for research purposes and does not enter commerce is also included." (Emphasis ours.)

The cited THD compounds are generally manifest only in tiny, often unmeasurable, quantities in very young plants.

Practical Effects

We next asked Perplexity.ai: How much seed or leaf of cannabis sativa would one have to ingest to experience any form of intoxication?

Perplexity replied:

Seeds: ordinarily, there is no practical amount of intact cannabis seed that reliably causes intoxication. Seeds produce negligible THC themselves; any THC is usually trace surface contamination from resinous plant material, and amounts vary widely.[1] (,

Leaves: there is no dependable gram amount. THC concentration differs enormously by plant type, growing conditions, leaf type, maturity, and whether the material was heated; swallowing raw leaf is generally much less psychoactive than consuming THC-containing material that has been heated, because much of the plant cannabinoid is present as THCA rather than active THC. Cannabis leaves can contain THC, but flower/trichome-rich material is typically the more potent part of the plant.[2][3]

A useful safety distinction is that intoxication tracks milligrams of active THC, not the weight of “seed or leaf.” Oral effects are delayed—often beginning about 30–90 minutes and potentially peaking around three hours—so taking more before effects are clear is a common reason people become uncomfortably intoxicated.[3]

Safety

Do not use seed/leaf ingestion as a way to estimate or test potency: contamination and potency are unpredictable, and substantial plant ingestion can also cause nausea or other unpleasant effects without a predictable intoxicating result. THC intoxication can include excessive sleepiness, impaired coordination, rapid heart rate, anxiety, or confusion.[4][3]

If this concerns an accidental ingestion—especially involving a child, pet, severe sleepiness, breathing problems, chest pain, severe anxiety, or confusion—call U.S. Poison Control at 1-800-222-1222 or use Poison Control’s online tool promptly.[5][6]

Sources
[1] Cannabis sativa (Hemp) Seeds, Δ9-Tetrahydrocannabinol ... https://pmc.ncbi.nlm.nih.gov/articles/PMC5665515/
[2] Cannabis (Marijuana) | National Institute on Drug Abuse https://nida.nih.gov/research-topics/cannabis-marijuana
[3] Cannabis: Risks and effects - Poison Control https://www.poison.org/articles/marijuana
[4] Cannabis health effects https://www.canada.ca/en/services/health/campaigns/cannabis/health-effects.html
[5] My child ate a cannabis edible | Poison Control https://www.poison.org/articles/my-child-ate-a-cannabis-edible
[6] Medical marijuana poisoning in kids https://www.poison.org/articles/medical-marijuana
[7] Can US Customs tell if a cannabis seed contains THC? https://dutch-passion.us/blog/post/can-us-customs-tell-if-a-cannabis-seed-contains-thc
[8] What are cannabis drinks? | Poison Control https://www.poison.org/articles/what-are-cannabis-drinks
[9] Can Halloween candy poison me? https://www.poison.org/articles/can-halloween-candy-poison-me
[10] Marijuana | Poison Control https://www.poison.org/poison-prevention-by-substances/marijuana