ArticleFrontiers in plant science2025
Elevated relative humidity significantly decreases cannabinoid concentrations while delaying flowering development in
Article in Frontiers in plant science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Relative humidity (RH) is critical for regulating transpiration, plant morphology, and the biosynthesis of secondary metabolites in crops. However, its specific impacts on cannabis ( Methods: Plants were cultivated under controlled conditions at two distinct RH ranges: low RH (37-58%) and high RH (78-98%). Growth metrics, including stem length, trunk diameter, number of nodes, apical internode spacing, and flowering time, were recorded weekly. Upon floral maturation and harvest, biomass and cannabinoid concentrations were measured. A total of 14 cannabinoids were quantified via high-performance liquid chromatography (HPLC) to assess compositional shifts under different RH conditions. Results: Cultivation under high RH resulted in a reduced vapor pressure deficit (VPD) ranging from 0.62 kPa to 0.25 kPa during flowering, indicating values outside the optimal range for cannabis cultivation. This environment led to significant reductions in total biomass (-75.3%), flower biomass (-71.0%), trunk diameter (-0.4%), and node count (29.3%), compared to low RH conditions (n = 10 per range, Discussion: This study highlights that elevated canopy-level humidity, outside optimal VPD thresholds, can significantly delay flowering, reduce biomass accumulation, and negatively impact cannabinoid concentrations in
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