Fixed Traits

Fixed traits refer to cannabis characteristics that are genetically stable and consistently expressed across generations when plants are properly bred and selected. In breeding programs, fixed traits form the foundation of stable cultivar development—breeders select for desired phenotypes and stabilize them through repeated selfing, backcrossing, or targeted crosses until the trait reliably appears in offspring. Common examples include leaf morphology, flowering time windows, and terpene profiles that remain consistent across a seed line. Understanding which traits are fixed versus segregating is essential for predictable breeding outcomes and for maintaining cultivar identity across commercial production cycles.

Breeders prioritize fixing desirable traits to create reliable seed lines and preserve cultivar genetics. Once a trait is fixed (typically homozygous at the relevant loci), it dramatically reduces phenotypic variation in descendant plants, allowing consistent crop planning and quality control in licensed production.