Vapor Pressure Deficit Sensitivity

Vapor Pressure Deficit (VPD) sensitivity refers to how Cannabis plants respond to the difference between air saturation and actual moisture content in the growing environment. Plants express this sensitivity through altered terpene volatilization, leaf surface transpiration rates, and stomatal behavior—factors breeders monitor to select for stable cultivars across variable humidity and temperature conditions. Lineage records frequently report that certain genetic backgrounds show wider tolerance windows for VPD fluctuations, while others require tighter environmental control. This trait is not an aroma itself, but rather a physiological characteristic that influences how volatile compounds are produced and released under different atmospheric pressures. Understanding VPD sensitivity helps breeders develop lines better suited to specific cultivation methods, from sealed indoor systems to

Breeders working in controlled-environment agriculture prioritize VPD stability to reduce phenotypic drift and ensure consistent terpene expression across batches. Selecting parent plants with robust VPD tolerance helps produce offspring that maintain vigor and aromatic consistency when grown by cultivators with varying climate-control precision.