Photoperiod

Photoperiod cannabis refers to plants that initiate flowering based on light cycle duration, typically requiring 12 hours or less of continuous light to trigger reproductive development. This classification encompasses the vast majority of cannabis genetics found in both wild and cultivated populations, distinguished from autoflowering varieties by their dependence on day-length signaling. Breeders working in traditional cannabis breeding have long documented photoperiod response as a core trait, with flowering timing varying significantly across cultivars—some triggering at 13-14 hours of light, others requiring shorter photoperiods. Photoperiod plants typically exhibit longer vegetative phases compared to autoflowering counterparts, allowing growers extended opportunity to establish plant structure before flowering begins. This trait family remains fundamental to breeding programs glob

Photoperiod genetics form the foundation of most modern cannabis breeding work, enabling breeders to manipulate flowering timing through controlled light environments and to maintain stable maternal lines through extended vegetative cycles. This trait is critical for preserving rare or complex genetic lineages, as photoperiod plants can be kept in vegetative state indefinitely under appropriate li