Quantitative Traits

Quantitative traits in cannabis refer to heritable characteristics controlled by multiple genes, each contributing small additive effects to the final phenotype. Unlike single-gene traits that produce discrete categories (e.g., male/female), quantitative traits display continuous variation across a population—examples include plant height, leaf width, flowering time, and cannabinoid potency. These traits are also influenced by environmental factors such as light, temperature, and nutrient availability, making them more complex to predict and stabilize in breeding programs. Breeders working with quantitative traits must track performance across multiple generations and grow conditions to identify consistent genetic contributions. Understanding quantitative inheritance is essential for developing stable cultivars and predicting offspring performance in cannabis breeding.

Breeders use quantitative trait analysis to select for desired characteristics like yield potential, frost tolerance, and terpene intensity across breeding populations. Stabilizing quantitative traits typically requires longer selection cycles and larger sample sizes than managing single-locus traits, since many genes influence the final expression.