The potency ceiling is the idea that dried cannabis flower can only contain so much cannabinoid, because cannabinoids are made only in the heads of capitate glandular trichomes and the rest of the bud is bract, leaf, stem and water. GenetixBay's house position is that flower above about 35% total cannabinoids is not credible. The founder credits Dr. Dedi Meiri with stating this limit at a seminar (publication pending).
In practice
Build it from first principles. Separated trichome heads, the purest form of the resin, typically test around 50-70% total cannabinoidsbeing reviewed. For flower to hit 40%, well over half its dry mass would have to be pure gland heads, while a dried bud is mostly plant tissue by weight. Add water: at 10-12% moisture, part of the weight is water. Add the 0.877 conversion: a raw THCA total overstates real THC. Numbers of 40%+ come from concentrates, lab shopping, basis tricks or inflated testing.
Rough check: flower % ≈ (share of dry mass that is gland heads) × (cannabinoid % of head material) × (1 - moisture). Total THC = Δ9-THC + 0.877 × THCA.
Myth check
Buyer beware: "our seeds will hit 42%" is marketing, not chemistry. Even 30% is a real feat. Evidence: Supported (label studies; Meiri seminar remarks). See buyer beware and Mythbusters.
A cannabinoid is any compound that binds the body's cannabinoid receptors or shares the typical cannabis terpenophenolic structure; the plant-made ones are phytocannabinoids such as THCA and CBDA.Total cannabinoids is the sum of all cannabinoids a lab measured in a sample, usually reported in % w/w, with acid forms either summed raw or decarboxylation-adjusted.Trichome heads are the bulbous resin-filled tops of capitate glandular trichomes, where cannabis makes and stores nearly all its cannabinoids and terpenes; they are the raw material of hash.The weight of cannabis after drying (and usually trimming), the basis growers use for yield; it is typically about 20-25% of trimmed wet weight.Total THC is a calculated figure, Δ9-THC plus 0.877 × THCA, estimating the maximum THC a sample could yield after full decarboxylation.THCA (tetrahydrocannabinolic acid) is the acid cannabinoid that drug-type cannabis makes in its trichomes; heat or time decarboxylates it into THC, losing about 12% of its mass.THC (Δ9-tetrahydrocannabinol) is the neutral, decarboxylated cannabinoid mainly responsible for cannabis's reported intoxicating effects; the living plant makes it almost entirely as THCA.Lab shopping is the practice of choosing testing labs because they report higher potency or more passing results, rather than because they are most accurate.Label inflation is the gap between the potency printed on cannabis packaging and what independent testing finds, a documented, mostly upward bias in retail THC claims.
