Potency Ratios

Potency ratios describe the relative proportions of cannabinoids in a cannabis plant, most commonly expressed as THC:CBD or THC:CBN ratios. These ratios are determined by the plant's genetic expression and environmental conditions during growth and cure. Breeders classify strains by their cannabinoid profiles—high-THC dominant (typically 15:1 or higher THC to CBD), balanced ratios (roughly 1:1), or CBD-dominant varieties (where CBD exceeds THC). Understanding potency ratios is fundamental to cannabis genetics work, as cannabinoid expression is controlled by multiple genes and enzymatic pathways. Accurate testing via chromatography is essential for documenting true ratios, since phenotypic variation and curing conditions can shift cannabinoid concentrations. Ratio breeding has become a major focus in modern genetic development, with cultivators selecting parents specifically for their doc

Breeders use documented potency ratios as primary selection criteria when developing new lines, choosing parent plants with consistent, measurable cannabinoid profiles to produce offspring with predictable ratios. Stability of potency ratios across generations is a key marker of genetic maturity in any breeding program.