Heat Sensitivity

Heat sensitivity refers to a plant's physiological response to elevated temperatures during cultivation, affecting growth rate, flowering timing, and cannabinoid expression. Cannabis genetics display varying degrees of temperature tolerance, with some lineages showing stress responses—such as leaf curl, reduced internodal spacing, or early senescence—when ambient conditions exceed their optimal range. Breeders working in tropical or warm-climate zones often select for heat-tolerant cultivars, while those in temperate regions may prioritize strains with lower temperature thresholds. Understanding a strain's heat sensitivity helps cultivators manage environmental conditions and predict phenotypic stability across seasons. Some landrace populations and their descendants exhibit adaptive traits for sustained heat exposure, whereas others require precise climate control to express intended ch

Breeders use heat-sensitivity data to develop cultivars suited to specific climates and to identify genetic markers for stress resilience. Selecting parent plants with demonstrated heat tolerance helps stabilize offspring performance in challenging growing environments.