Long Day Requirement
Long Day Requirement refers to cannabis plants that exhibit photoperiod sensitivity tied to extended light cycles. Breeders and researchers classify certain cultivars as "long day" types when they show delayed flowering initiation under standard 12-hour light/12-hour dark photoperiods, instead requiring or responding optimally to longer daily light exposure. This trait is less common in cannabis than short-day sensitivity, but appears in some regional landraces and breeding lines developed in higher latitudes or under extended-season conditions. Understanding photoperiod classification helps cultivators and breeders predict flowering timing and optimize light scheduling for controlled environments.
Long Day Requirement strains
No strains tagged into Long Day Requirement yet — they'll appear here as breeders submit lineage records under this classification.
Long Day Requirement refers to cannabis plants that exhibit photoperiod sensitivity tied to extended light cycles. Breeders and researchers classify certain cultivars as "long day" types when they show delayed flowering initiation under standard 12-hour light/12-hour dark photoperiods, instead requiring or responding optimally to longer daily light exposure. This trait is less common in cannabis than short-day sensitivity, but appears in some regional landraces and breeding lines developed in higher latitudes or under extended-season conditions. Understanding photoperiod classification helps cultivators and breeders predict flowering timing and optimize light scheduling for controlled environments.
Breeders working with long-day types may select these plants for cultivation systems designed around extended growing seasons or supplemental lighting protocols. This classification aids in breeding programmes focused on adapting genetics to greenhouse or outdoor environments with naturally longer daylight periods.
Educational reference · Cultivar metadata only · No medical claims