Time Of Day Sampling

Time-of-day sampling refers to the practice of evaluating cannabis plant aromas at different periods throughout a 24-hour cycle, recognizing that volatile terpene profiles can fluctuate based on light exposure, temperature, and circadian-like rhythms in plant metabolism. Terpene expression often peaks during specific hours—commonly in early morning or late evening—when stomatal activity and enzymatic processes differ from midday conditions. Breeders and researchers use this sampling method to obtain a more complete aromatic profile than single-point assessment, since a strain's true terpene bouquet may only fully express during certain windows. This practice is particularly relevant when evaluating parent plants for breeding, as consistent aromatic output across day/night cycles can indicate genetic stability. Standardized time-of-day sampling protocols help reduce variability in sensory

Breeders employ time-of-day sampling to identify genetics with robust, consistent terpene production that persists throughout the photoperiod—a desirable trait for stable cultivar development. Understanding when peak aromatic expression occurs helps inform harvest timing decisions and ensures that sensory profiles remain predictable across different cultivation setups.