Environmental Factors In Expression

Terpene expression in cannabis is not fixed by genetics alone—environmental conditions during growth, flowering, and post-harvest handling significantly influence which terpenes are synthesized and in what proportions. Temperature, light spectrum, humidity, soil composition, and stress conditions can all shift the volatile organic compound profile of a plant, even within the same cultivar grown under different circumstances. Researchers and breeders have documented that identical genetic lines often produce markedly different terpene ratios when cultivated in different climates or under varying nutrient regimens. Understanding these variables is critical for consistent phenotype documentation, breeding program planning, and interpreting terpene data across multiple grow environments. This relationship between genotype and environment (phenotype plasticity) remains an active area of canna

Breeders monitoring terpene profiles for selective breeding must account for environmental variables when evaluating offspring, as a single plant's volatile profile can shift substantially between seasons or facilities. Standardized growing protocols and controlled environment chambers are increasingly used in breeding programs to isolate genetic terpene expression from environmental noise.