Seed Type Photoperiod

Photoperiod seeds are cannabis plants that rely on changes in light cycles to transition from vegetative growth to flowering. Unlike autoflowering varieties, photoperiod plants require specific day-length triggers—typically a shift to 12 hours of light and 12 hours of darkness—to initiate reproductive development. This family encompasses the vast majority of traditional cannabis cultivars and landrace genetics documented across breeding records. Photoperiod genetics are foundational in modern seed development, allowing breeders to maintain plants in vegetative stages for extended periods, create deliberate crosses, and preserve elite genetics through cloning. The extended cultivation timeline demands controlled environments or seasonal outdoor growing, making photoperiod breeding a cornerstone of professional cultivation practices.

Breeders favor photoperiod genetics for precision work because the controllable flowering trigger enables multi-generational selection, backcrossing programs, and stable F1 hybrid production. The ability to keep mothers and fathers vegetative indefinitely supports conservation of rare or desirable lineages.