Surface Vs Subsurface Glands

Cannabis plants produce cannabinoids and terpenes in specialized structures called glands or trichomes, which vary in location and morphology. Surface glands—commonly observed as translucent stalked or sessile trichomes on flowers and leaves—are visible to the naked eye and often studied in breeding programs. Subsurface glands, also called internal or subepidermal glands, develop beneath the leaf epidermis and are less accessible for visual selection. Breeders working in this category have noted that surface gland density correlates with resin production and ease of hand-harvest evaluation, while subsurface glands may contribute to overall metabolite accumulation. Understanding the distribution and development of both gland types remains relevant to lineage selection and cultivation optimization. This classification reflects how trichome morphology and placement influence breeding priori

Breeders often prioritize surface gland visibility when selecting parent plants, as external trichome density serves as a practical phenotypic marker. Some lineages are noted for balanced gland distribution across both surface and subsurface zones, which may influence overall resin composition and plant vigor.