Rh Sensitivity

Relative humidity (RH) sensitivity refers to how cannabis plant phenotypes respond to varying moisture levels in their growing environment. Some cultivars and strain families exhibit heightened sensitivity to RH fluctuations, affecting trichome development, terpene expression, and susceptibility to mold or powdery mildew. Breeders working in humid or variable-climate regions often select for RH-tolerant genetics to maintain consistent cannabinoid and terpene profiles across growing seasons. Plants with lower RH sensitivity tend to preserve aromatic compounds more reliably when environmental conditions shift. Understanding a strain's RH sensitivity is critical for cultivators aiming to standardize phenotype expression and minimize environmental stress responses.

Breeders prioritize RH sensitivity traits when developing cultivars for specific geographic regions or indoor systems with humidity control limitations. Selecting parent plants that maintain stable terpene and resin production under variable RH conditions helps stabilize offspring phenotypes and reduce crop loss from environmental stress.