Reproductive Vigor

Reproductive vigor refers to a plant's capacity to produce viable pollen, viable seeds, or robust flowering structures across multiple generations. In cannabis breeding, this trait encompasses seed set reliability, pollen viability, and consistent flowering performance across varied environmental conditions. Breeders working with heritage or landrace genetics often observe higher reproductive vigor in F1 and F2 generations, though inbreeding depression can reduce this trait over successive generations. Reproductive vigor is distinct from yield or potency—it describes the plant's fundamental biological ability to propagate. Preservation of genetically diverse parent lines helps maintain this trait in breeding programs. Documentation of seed count, germination rates, and pollen production across seasons provides breeders with measurable reproductive vigor data.

Breeders prioritize reproductive vigor when establishing stable seed lines, maintaining germplasm banks, or creating F1 hybrids intended for seed production. Loss of vigor signals genetic bottlenecking and informs decisions about outcrossing, line rotation, or introduction of new parent material.