Glandular Trichome Expression

Glandular trichome expression refers to the visible density and morphology of resin-producing structures on cannabis plant surfaces, particularly flowers and leaves. These microscopic hair-like appendages contain cannabinoid and terpene-producing cells, with expression levels influenced by genetics, environmental conditions, and plant maturity. Classification systems typically categorize plants as showing high, moderate, or low glandular trichome expression based on observable resin coating. Breeders and cultivators track trichome expression as a visible marker of secondary metabolite production potential, though expression alone does not determine final cannabinoid or terpene profiles. This trait is commonly documented across strain lineages and remains a standard phenotypic descriptor in cultivation records.

Breeders select for consistent glandular trichome expression when developing stable lines, as visible resin coverage serves as a reliable phenotypic indicator during early-stage parent plant selection. Dense trichome expression in target parents can correlate with higher cannabinoid and terpene accumulation potential across generations.