Bulbous Gland Expression

Bulbous gland expression refers to the morphology and density of glandular trichomes—specifically the larger, resinous heads that form on cannabis flowers and leaves. These structures accumulate cannabinoids and terpenes, and their prominence varies significantly across cultivars due to genetic background and environmental conditions. Bulbous gland expression is often assessed by breeders and cultivators as an indicator of resin production potential, though visual gland density does not necessarily correlate directly with cannabinoid content. Lineage records frequently report that certain landrace and modern hybrid lines exhibit notably bulbous or pronounced glandular morphology. This trait is inherited polygentically, meaning multiple genes influence the final phenotypic expression. Understanding gland structure remains foundational to cannabis breeding selection and cultivation practic

Breeders working in resin-focused programs often select for bulbous gland expression as a visual marker during phenotype evaluation, viewing it as one indicator among many for yield potential and trichome density. Crossing lines known for pronounced glandular expression with complementary genetics has been a conventional strategy in contemporary breeding work.