Genotype Environment

Genotype-environment interaction (G×E) refers to how a cannabis plant's genetic potential responds differently across varying growing conditions. The same cultivar can express distinct terpene profiles, cannabinoid ratios, and morphology when grown indoors versus outdoors, at different altitudes, or under varying light spectra and nutrient regimes. Breeders and researchers recognize that terpene expression is not fixed—environmental stress, photoperiod length, soil composition, and temperature fluctuations all modulate which genes activate. Understanding G×E is essential for stable strain development, as inconsistent terpene profiles between harvest locations can indicate either weak genetic stability or significant environmental drift. Modern breeding programs increasingly document phenotypic variance across environments to identify which traits remain heritable versus environmentally p

Breeders use G×E knowledge to select for environmental stability—cultivars that maintain consistent terpene and cannabinoid expression across multiple growing contexts. Multi-location phenotypic trials help distinguish true genetic traits from environmentally induced variation, improving cultivar reliability for both commercial and preservation purposes.