Red Far Red Light Sensing

Red and far-red light sensing refers to a plant's photomorphogenic response to light wavelengths, regulated by phytochrome proteins. In cannabis cultivation, this mechanism influences flowering initiation, stem elongation, and canopy architecture—traits breeders and growers manipulate through photoperiod management. Plants exhibiting stronger far-red light sensitivity may show extended vegetative growth or delayed flowering under certain light spectra. This is not a terpene but rather a physiological trait affecting plant development. Understanding this response helps breeders select for photoperiod-dependent cultivars and informs controlled environment agriculture practices.

Breeders working with photoperiod-sensitive genetics select for consistent red/far-red light response to stabilize flowering windows and plant morphology. This trait is particularly relevant in breeding for automated flowering cycles and optimizing cultivars for specific lighting systems.