Heat Sensitivity

Heat sensitivity in cannabis refers to a plant's susceptibility to temperature stress during cultivation, particularly elevated growing conditions. Plants expressing heat sensitivity may show signs of stress—such as reduced vigor, altered terpene expression, or reproductive challenges—when ambient temperatures exceed their optimal range. This trait varies widely across strains and is often linked to specific geographic origins; equatorial and tropical landraces typically exhibit greater heat tolerance, while high-altitude or temperate-climate genetics may show higher sensitivity. Understanding a plant's heat sensitivity profile is crucial for breeders selecting parents for stable indoor and outdoor cultivars, especially in regions experiencing warming trends or extreme seasonal variation.

Breeders working with heat-sensitive genetics often incorporate heat-tolerant parent material to improve stability in warm environments. This trait is particularly relevant for selecting cultivars suited to specific climatic zones and for developing resilience in controlled-environment agriculture where temperature management is a production variable.