Geosmin

Geosmin is an organic compound commonly detected in cannabis cultivars with earthy, petrichor-like aromatic profiles. This volatile terpene is also responsible for the distinctive scent of rain on soil and is naturally produced by certain microorganisms. In cannabis genetics, geosmin presence is often tagged as part of broader "earthy" terpene expressions, though it remains one of the least-studied minor terpenes in breeding documentation. Lineage records frequently report geosmin detection in older landrace lines and modern cultivars emphasizing soil-forward flavor signatures. Its role in the overall cannabinoid-terpene matrix remains largely unexplored from a breeding perspective.

Breeders working in the earthy, soil-forward phenotype category sometimes track geosmin expression as a minor marker alongside dominant terpenes like myrcene and limonene. Stabilizing geosmin-forward expressions typically requires multi-generational selection and is considered a niche breeding focus rather than a primary trait target.