Temperature Phenotype

Temperature phenotype refers to the observable characteristics of cannabis plants that vary significantly based on growing environment conditions, particularly temperature ranges during vegetative and flowering stages. Breeders and cultivators have documented that identical genotypes can express different morphologies, pigmentation, terpene profiles, and growth rates when exposed to different thermal conditions. Cool-temperature environments often correlate with more compact growth, enhanced anthocyanin expression (purples and blues), and shifts in volatile compound ratios. Conversely, warm-temperature environments typically favor taller plants with different resin compositions. Understanding temperature phenotypes is critical for standardizing breeding work, as environmental factors can mask or amplify genetic traits.

Breeders working with temperature phenotypes must maintain controlled conditions to reliably identify true genetic traits versus environmentally-induced variations. Selecting parent plants and stabilizing lines requires consistent temperature protocols to ensure reproducible phenotypic expression across generations.