Transpiration Physiology

Transpiration physiology refers to the plant's water vapor release through stomata and leaf surfaces—a fundamental process that influences volatile organic compound (VOC) distribution and expression in cannabis cultivars. The rate and efficiency of transpiration directly affects how secondary metabolites, including terpenes and cannabinoids, accumulate and volatilize in living tissue. Breeders and cultivators monitor transpiration patterns because they correlate with plant vigor, environmental stress response, and the intensity of aromatic expression. Cannabis lineages selected for vigorous transpiration often exhibit robust growth and consistent terpene profiles, while cultivars with restricted transpiration may show altered volatile expressions. Understanding transpiration physiology is essential for controlled environment agriculture (CEA) optimization and for predicting how genetics

Breeders select for transpiration efficiency when developing cultivars adapted to specific climate zones or cultivation systems. High-transpiration genetics require active environmental management but often reward with enhanced aromatic expression, while low-transpiration lines may suit water-restricted or high-humidity settings.