Line Fixation

Line fixation refers to the breeding practice of stabilizing desired genetic traits across successive generations through selective reproduction. Breeders working with cannabis pursue line fixation to establish consistent phenotypic expression—morphology, terpene profiles, flowering time, and cannabinoid ratios—across plants grown from the same seed lot. This process typically involves multiple generations of controlled crosses or self-pollination, combined with rigorous phenotype selection. Line fixation is foundational to creating true-breeding cultivars and is documented across heirloom landrace preservation and modern cannabis breeding programs. The term itself is not a terpene but rather a breeding methodology central to genetic stability in cannabis seed development.

Breeders use line fixation protocols to produce F1 hybrids, IBLs (inbred lines), and stable cultivars with reproducible traits. Achieving high line fixation reduces phenotypic variation, enabling seed companies to deliver consistent products across multiple harvests and grow environments.