Diurnal Terpene Variation

Diurnal terpene variation refers to the cyclical changes in volatile compound profiles that occur across a 24-hour period in cannabis plants. Research in aromatic chemistry suggests terpene concentrations—particularly limonene, myrcene, and pinene—may shift in response to circadian rhythms, light exposure, and temperature fluctuations throughout the day and night. This phenomenon has been documented in various plant species and is believed to relate to plant defense mechanisms and pollinator attraction timing in natural environments. In cultivation, diurnal variation may influence harvest timing decisions, post-harvest handling protocols, and the preservation of volatile profiles during drying and curing. Breeders and cultivators studying this pattern contribute to understanding how environmental conditions interact with a plant's genetic terpene expression over time.

Breeders investigating diurnal patterns work to identify and stabilize genotypes that express consistent aromatic profiles regardless of circadian fluctuations, supporting predictable phenotypic outcomes. Understanding this variation also informs cultivation practices that may optimize volatile preservation at specific harvest windows.