Reduced Transpiration

Reduced transpiration refers to a plant trait where cannabis exhibits lower rates of water vapor loss through leaves and stems. Breeders working in arid or low-humidity environments often select for this characteristic, as it can improve drought tolerance and water-use efficiency. The trait is typically expressed through waxy leaf coatings, smaller stomatal density, or thicker cuticles—physical adaptations that limit evaporative water loss. This is primarily a structural and physiological marker rather than an aroma descriptor, though it may indirectly influence terpene concentration by affecting plant stress responses. Understanding reduced transpiration helps breeders develop cultivars suited to challenging growing conditions.

Breeders in water-scarce regions or those developing outdoor-adapted cultivars prioritize reduced transpiration to lower irrigation demands and improve survival rates in drought conditions. Selection for this trait often correlates with enhanced resin production and cannabinoid concentration, as water-stressed plants may redirect resources toward secondary metabolites.