Temperature Stress Selection

Temperature stress selection refers to breeding practices where growers or breeders intentionally expose plants to non-ideal temperature conditions—either heat or cold—to identify and propagate genetics with superior stress tolerance. This selection method has been used across agricultural crops for decades and is documented in cannabis breeding records as a way to develop lines suited to challenging climates or outdoor cultivation. Plants exhibiting vigor, maintained growth rates, or reduced damage under temperature extremes are typically retained for breeding. The approach assumes that stress-tolerance traits have heritable genetic components that can be concentrated through successive generations. Temperature-stressed phenotypes often show altered morphology, terpene profiles, or cannabinoid expression, though these changes are environmentally triggered rather than fixed genetic trait

Breeders use temperature stress selection to develop stable lines for outdoor cultivation in challenging climates and to identify plants with robust cellular repair mechanisms. This method helps establish breeding populations adapted to real-world environmental variability rather than controlled indoor conditions.