Temperature Humidity Ratios

Temperature and humidity ratios (VPD – vapor pressure deficit) are environmental conditions that significantly influence terpene expression during cannabis cultivation, rather than terpenes themselves. Breeders and cultivators recognize that terpene profiles vary substantially based on grow conditions: cooler, drier environments often correlate with different volatile compound ratios than warm, humid conditions. These environmental factors affect how plants synthesize and retain terpenes throughout flowering and the post-harvest window. Understanding VPD dynamics is foundational to phenotype stabilization in breeding programs, as the same genetic line may express distinct aromatic profiles under different climate regimes. Lineage records frequently note that terpene consistency requires precise environmental documentation alongside genetic information.

Breeders working in controlled-environment agriculture use VPD data to identify which genetic lines express stable, desirable terpene profiles across varying conditions. This knowledge informs selection criteria for lines bred for consistency in commercial or seed production.