Transpiration

Transpiration in cannabis refers to the process by which plants release water vapor through their stomata (leaf pores) and other plant tissues. This physiological process is distinct from the terpene chemistry commonly discussed in cannabis genetics, but it significantly influences how volatile aromatic compounds are expressed and distributed within the plant canopy. Environmental factors—light intensity, humidity, temperature, and air circulation—directly regulate transpiration rates, which in turn affect terpene volatility and concentration patterns throughout the growing cycle. Breeders and cultivators monitor transpiration management as it impacts both plant health and the timing of peak aromatic compound accumulation. Understanding transpiration is essential for optimizing cultivation conditions that support robust terpene expression in target phenotypes.

Breeders select for plant structures and leaf morphologies that support efficient transpiration, as this enhances nutrient uptake and supports metabolic processes that generate terpene biosynthesis. Genetic lines with improved transpiration regulation often show more consistent terpene profiles across growing environments, making them valuable for commercial stability and phenotype expression.