Flowering Time

Flowering time refers to the duration between when a cannabis plant transitions to reproductive growth and when it reaches harvestable maturity. In photoperiod cultivars, this clock begins when light cycles shift to 12 hours or less; in autoflowering varieties, the transition is genetically predetermined and occurs regardless of light. Breeders classify plants into categories—typically 7–9 weeks, 9–11 weeks, or 11+ weeks—to standardize production timelines and match growing environments. Flowering duration is a heritable trait influenced by both genetics and environmental factors like temperature and nutrient availability. Understanding a strain's flowering window is essential for indoor cultivation planning, outdoor harvest scheduling, and commercial crop management. Historical landraces and modern crosses show wide variation, reflecting adaptation to diverse climates and selective bree

Breeders actively select for flowering time to develop cultivars suited to specific growing conditions and market demands. Early-finishing lines are valued for rapid crop turnover, while extended-flowering genetics may produce larger yields or more complex terpene profiles.