Long Night Trigger

Long Night Trigger refers to photoperiod-dependent flowering characteristics observed in certain cannabis lineages, where plants require extended dark periods to initiate and sustain reproductive development. This trait is commonly associated with equatorial and tropical cannabis genetics that evolved under consistent day-length cycles. Breeders working in this category often document how these plants remain vegetative under longer photoperiods (18+ hours light) and transition to flowering only when dark periods extend meaningfully—typically 12 hours or longer. The trait influences cultivation scheduling, particularly for indoor growers managing artificial lighting. Long Night Trigger genetics are frequently retained in breeding programs focused on photoperiod-sensitive cultivars and breeding stock preservation.

Breeders intentionally maintain Long Night Trigger lineages to develop cultivars suited to controlled indoor environments and to preserve photoperiod-dependent genetics for research and heritage breeding. Understanding this trait helps predictably manage flowering windows and stability across generations.