Diurnal Fluctuation

Diurnal fluctuation refers to the daily cyclical variation in terpene concentration and volatile compound expression within cannabis plants, typically peaking during specific daylight hours and declining at night. This temporal pattern reflects the plant's circadian rhythms and environmental response to light, temperature, and humidity cycles. Breeders and cultivators have observed that certain chemotypes express higher terpene yields during morning or afternoon periods, suggesting genetic programming of volatile biosynthesis. Understanding these cycles is relevant to harvest timing strategies, as terpene profiles may shift significantly between dawn and dusk. This phenomenon remains an active area of research in cannabis horticulture and breeding optimization.

Growers and breeders working in controlled-environment agriculture track diurnal terpene fluctuations to refine harvest windows for maximum volatile preservation. Cultivars exhibiting stable, high-amplitude diurnal patterns may offer more predictable quality outcomes in commercial production schedules.