Autoflower Physiology

Autoflower physiology describes the genetic mechanisms that trigger flowering independent of photoperiod, typically inherited from Cannabis ruderalis ancestry. Unlike photoperiodic varieties that require specific light-dark cycle ratios, autoflowering plants transition to bloom based on internal developmental timing—often around 3–4 weeks of vegetative growth. This trait is controlled by multiple genes and remains an active area of breeding research; inheritance patterns vary across cultivars, and environmental stress can modulate flowering timing. The physiological underpinning involves altered circadian signaling and hormonal regulation compared to photoperiodic chemotypes. Breeders have stabilized autoflowering genetics across diverse backgrounds, though early-generation crosses often show variable flowering schedules.

Breeders working with autoflowering genetics cross ruderalis-derived lines into commercial phenotypes to transfer the flowering-time locus while maintaining desirable yield and cannabinoid profiles. Understanding autoflower physiology is critical for developing stable F2+ lines and selecting for consistency in flowering onset across generations.