CBG
Definition: CBG, short for cannabigerol, is a non-intoxicating cannabinoid formed from CBGA, the acid precursor that cannabis converts into THCA, CBDA and CBCA. Because most CBGA gets converted, typical strains contain less than 1% CBG at harvest. Specially bred CBG-dominant varieties lack working conversion enzymes and can accumulate high levels.
How CBG works
Growers sometimes call CBG the mother cannabinoid. The nickname refers to its acid form, CBGA, which sits at the start of the cannabinoid assembly line. Enzymes in the trichomes turn CBGA into THCA, CBDA or CBCA, so in most plants only a small amount remains by the end of flowering.
How CBG-dominant cannabis works
In the 2000s, researchers working with hemp identified plants carrying a non-functional version of the synthase enzymes. Without that conversion step, CBGA builds up instead of becoming THCA or CBDA. Breeders have since developed CBG-dominant varieties, mostly from hemp genetics, that can test well above 10% CBG with very little THC.
Growing and harvest notes
- CBG-dominant plants grow much like CBD hemp, and many are tall and vigorous.
- In standard strains, CBG levels are highest earlier in flowering, before most CBGA is converted. Harvesting early to chase CBG costs THC and yield, so it rarely makes sense.
- Detailed lab reports list CBG separately, and it is often under 1% in THC-dominant flower.
What users report
CBG does not bind strongly to the receptors THC activates and is not considered intoxicating. Research on its effects in people is limited, so most of what you read about CBG remains early-stage or anecdotal.