Relative Humidity Cultivation

Relative humidity (RH) during cultivation is an environmental factor that influences terpene expression and volatile compound development in cannabis plants. RH levels—typically maintained between 40-60% during vegetative stages and 40-50% during flowering—affect how readily terpenes are synthesized and retained in trichomes. Higher humidity can promote certain secondary metabolite pathways, while lower RH may stress plants and trigger defensive terpene production. Understanding RH's role in terpene development is relevant for breeders seeking to stabilize or enhance specific aromatic profiles across generations, though environmental conditions interact complexly with genetic potential.

Breeders working with terpene-stable lines often document cultivation humidity as a standardization variable, since inconsistent RH can mask or amplify phenotypic traits during selection. Controlled RH environments help isolate genetic terpene expression from environmental noise, making it easier to identify and propagate lines with desired aromatic consistency.