Secondary Volatile Expression

Secondary volatile expression refers to aromatic compounds that emerge during later stages of cannabis plant development, distinct from primary terpenes present in early growth. These volatiles—often including sesquiterpenes, ketones, and aldehydes—develop through environmental stress, maturation, and curing processes rather than genetic expression alone. Breeders and cultivators commonly observe secondary volatile emergence during flowering and post-harvest handling, where chemical transformations create novel aromatic profiles. This category is distinct from primary terpenes like limonene or myrcene, which dominate earlier phenophases. Secondary volatile expression varies significantly across genotypes and growing conditions, making it a point of interest for breeders developing cultivars with specific late-stage aroma signatures.

Breeders working in aroma development track secondary volatile expression to understand which genetic backgrounds reliably produce desired aromatic complexity during curing and storage. Selective breeding for stable secondary volatile profiles requires extended phenotyping across multiple crop cycles and environmental conditions.