How the Plant Makes Cannabinoids and Terpenes

THE PLANT

Cannabis makes cannabinoids in its trichomes through a chain of enzyme steps: two building blocks form CBGA, enzymes convert it into acids such as THCA and CBDA, and heat turns those into THC and CBD. Following that chain explains the acidic forms (THCA, CBDA), the “mother” cannabinoid CBGA, and why heat is needed to feel most effects.

It starts with CBGA

The pathway begins when two building blocks combine into cannabigerolic acid (CBGA), the “mother cannabinoid”. CBGA is the shared precursor from which the major cannabinoid acids branch.

Enzymes split the path

Specific enzymes convert CBGA into the acidic forms of the main cannabinoids: THCA synthase makes THCA, CBDA synthase makes CBDA, and CBCA synthase makes CBCA. Which enzymes a plant has, set by its genetics, decides whether it is THC-dominant, CBD-dominant or balanced.

This is the molecular basis of chemotype.

Why raw cannabis is not intoxicating

The plant makes acids (THCA, CBDA), not the neutral compounds. THCA is not intoxicating. Only when heat drives off a carbon-dioxide group, a reaction called decarboxylation, does THCA become THC. This is why raw flower must be heated to feel most effects.

Terpenes, made alongside

The same trichomes produce terpenes, the volatile molecules behind aroma, through a separate but parallel pathway. Cannabinoids and terpenes are made together, which is why a plant’s smell and its chemotype are linked.

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