Microbial Derived Volatiles

Microbial-derived volatiles (MDVs) are organic compounds produced by fungi, bacteria, and other microorganisms in the soil and plant rhizosphere. In cannabis cultivation, these compounds—including geosmin, dimethyl disulfide, and various terpene-like molecules—are often detected in dried flower and have been documented in breeding literature as secondary metabolites influenced by soil microbiology. MDVs are commonly associated with earthy, petrichor-like, or mineral aromas rather than primary plant terpene production. Their presence and intensity can vary significantly based on growing medium composition, microbial community health, and post-harvest processing. Understanding MDV contribution to aroma profiles is relevant for cultivators managing soil biology and for breeders selecting for specific sensory characteristics.

Breeders working in organic and living-soil production systems often observe MDV expression as a secondary trait influenced by cultivation practices rather than genetics alone. Lineage records from craft growers frequently note that certain genetic backgrounds—particularly older landrace-derived lines—may express more pronounced microbial-influenced aromatic complexity when cultivated in biodivers