Diurnal Terpene Expression

Diurnal terpene expression refers to the cyclical variation in volatile compound production throughout a 24-hour photoperiod, where cannabis plants often show measurable fluctuations in terpene concentration depending on light and dark cycles. Research on circadian regulation in plants suggests that terpene biosynthesis in cannabis may peak at specific times of day, influenced by environmental factors such as light intensity, temperature, and humidity rhythms. This phenomenon has been documented in breeding programs where harvest timing and sampling methodology can significantly affect measured terpene profiles. Understanding diurnal patterns is relevant to quality control and standardization efforts, as terpene levels recorded at dawn may differ materially from evening measurements on the same plant.

Breeders and cultivators working on terpene stability and consistency must account for diurnal fluctuations when establishing baseline chemical profiles for strain verification. Standardized sampling protocols—such as fixed harvest times—have become important for accurate lineage documentation and breeding record-keeping.