Light Cycle Volatiles

Light cycle volatiles refer to terpene and aromatic compound fluctuations that occur in cannabis plants in response to circadian rhythms and photoperiod changes. These compounds—including limonene, myrcene, and pinene—often show measurable variation between light and dark periods, with some research suggesting peak expression during specific hours of the day. Breeders and cultivators have long observed that harvest timing relative to light cycles can influence the aromatic profile of dried material. This phenomenon remains an active area of study in cannabis horticulture, with growers documenting shifts in volatile composition based on when plants are harvested within their daily light schedule. Understanding light cycle volatiles is relevant for standardization efforts and for genetic lines selected for consistent terpene expression.

Breeders working with terpene-focused cultivars study light cycle volatility to identify and stabilize genetics that maintain aromatic consistency regardless of photoperiod stress. Selecting for genetic stability in volatile compound production—independent of light timing—supports more predictable phenotypes across growing environments.