Trichome Head Size

Trichome head size refers to the diameter of the bulbous, resinous glandular structures (glands) that crown the stalks of cannabis trichomes. These microscopic heads contain cannabinoids, terpenes, and flavonoids. Classification systems typically categorize trichomes as small-headed, medium-headed, or large-headed based on microscopic observation. Head size correlates with resin production capacity and can influence harvest timing decisions. Breeders track this trait as an indicator of chemical yield potential and plant maturity markers.

Cultivators and breeders select for larger trichome head size when targeting high cannabinoid and terpene concentrations, as larger glands generally contain more resinous material. Head size development is influenced by genetics, light intensity, nutrient availability, and flowering stage, making it a useful phenotypic marker for identifying chemically productive lines within a breeding population