Short Day
Short Day refers to cannabis plants that initiate flowering based on photoperiod sensitivity, requiring approximately 12 hours or less of daily light exposure to transition from vegetative growth. This classification describes the plant's natural response to seasonal light changes, a trait preserved through both landrace and modern cultivar development. Most cannabis varieties exhibit short-day characteristics to varying degrees, though sensitivity thresholds and flowering speed differ across genetic backgrounds. Breeders working in this category have long selected for photoperiod stability and consistent flowering timing. Understanding short-day mechanisms is fundamental to controlled indoor cultivation and breeding programs that depend on manipulating light cycles.
Short Day strains
No strains tagged into Short Day yet — they'll appear here as breeders submit lineage records under this classification.
Short Day refers to cannabis plants that initiate flowering based on photoperiod sensitivity, requiring approximately 12 hours or less of daily light exposure to transition from vegetative growth. This classification describes the plant's natural response to seasonal light changes, a trait preserved through both landrace and modern cultivar development. Most cannabis varieties exhibit short-day characteristics to varying degrees, though sensitivity thresholds and flowering speed differ across genetic backgrounds. Breeders working in this category have long selected for photoperiod stability and consistent flowering timing. Understanding short-day mechanisms is fundamental to controlled indoor cultivation and breeding programs that depend on manipulating light cycles.
Short-day genetics form the basis for most photoperiod-dependent breeding work. Breeders select parents with reliable, rapid short-day response to develop stable F1 hybrids and maintain predictable flowering schedules in commercial and research settings.
Educational reference · Cultivar metadata only · No medical claims