Short Day Cultivars

Short day cultivars are cannabis plants selected or bred to flower in response to shortened photoperiods, typically triggered by 12 hours or less of daily light exposure. These varieties are commonly associated with equatorial and subtropical growing regions where day length naturally varies minimally throughout the year. In breeding programs, short day genetics serve as foundational material for developing photoperiod-dependent strains, contrasting with day-neutral autoflowering varieties. Lineage records frequently report short day traits in landrace populations and heirloom cultivars originating from regions between 30°N and 30°S latitude. Understanding short day cultivars is essential for breeders working with traditional photoperiod-sensitive genetics and for cultivators managing light cycles in controlled environments.

Breeders utilize short day cultivars to maintain traditional flowering mechanisms and to preserve genetic diversity in photoperiod-dependent lines. These genetics form the backbone of most hybrid development, as crossing short day parents allows precise control over flowering timing in subsequent generations.