Tannin Expression

Tannin expression refers to the presence and prominence of tannic compounds in cannabis plant material, particularly in flowers and leaves. These polyphenolic compounds contribute to astringent sensory properties and are influenced by genetics, cultivation conditions, and plant maturity. Tannin-heavy phenotypes are often observed in certain landrace and heirloom genetics, where they accumulated through environmental adaptation in particular growing regions. Breeders working with this trait note that tannin levels vary significantly across strain families and can shift based on harvest timing and curing practices. Understanding tannin expression is relevant for breeding programs focused on specific flavor complexity and plant chemistry diversification.

Breeders tracking tannin expression use it as a secondary phenotypic marker when developing strains targeting particular chemotype profiles. Documentation of tannin prominence helps distinguish between related cultivars and informs selection strategies for preserving rare genetic backgrounds.