Short Day Dependent
Short Day Dependent (SDD) refers to cannabis plants that require a specific photoperiod—typically 12 hours or fewer of light per 24-hour cycle—to initiate and complete flowering. This classification distinguishes these plants from autoflowering varieties, which flower based on plant age rather than light duration. SDD genetics are commonly associated with traditional photoperiod-sensitive landraces and many modern seed-line cultivars. Breeders working with SDD material often select from equatorial and tropical origins where day length naturally varies seasonally. Understanding photoperiod sensitivity remains foundational in controlled breeding environments and indoor cultivation strategies.
Short Day Dependent strains
No strains tagged into Short Day Dependent yet — they'll appear here as breeders submit lineage records under this classification.
Short Day Dependent (SDD) refers to cannabis plants that require a specific photoperiod—typically 12 hours or fewer of light per 24-hour cycle—to initiate and complete flowering. This classification distinguishes these plants from autoflowering varieties, which flower based on plant age rather than light duration. SDD genetics are commonly associated with traditional photoperiod-sensitive landraces and many modern seed-line cultivars. Breeders working with SDD material often select from equatorial and tropical origins where day length naturally varies seasonally. Understanding photoperiod sensitivity remains foundational in controlled breeding environments and indoor cultivation strategies.
Breeders leverage SDD genetics to maintain precise control over crop timing and generation schedules in indoor facilities. SDD lines allow deliberate backcrossing, hybrid development, and trait stabilization through multiple controlled seasons without the time constraints of automatic flowering.
Educational reference · Cultivar metadata only · No medical claims