Genotype Environment Interaction

Genotype-environment interaction (G×E) refers to the phenomenon where a cannabis plant's genetic potential is expressed differently depending on environmental conditions. The same cultivar grown under varying light spectra, temperature ranges, humidity levels, or nutrient regimens may display distinct phenotypic characteristics—affecting cannabinoid profiles, terpene expression, plant morphology, and yield. Breeders and researchers recognize G×E as a critical factor in understanding why strain performance varies across grow rooms, climates, and cultivation methods. This classification helps growers and breeders distinguish between traits that are strictly genetic versus those shaped by environmental pressures. Documenting G×E patterns is essential for stabilizing breeding lines and predicting cultivar behavior across different production systems.

Plant breeders track G×E to identify which traits remain stable across environments (desirable for commercial consistency) and which respond plastically to conditions (useful for adapting cultivars to specific regional or indoor growing setups). Understanding these interactions informs selection criteria and helps breeders develop more resilient, predictable lines.