Ammonia Sulfur Notes

Ammonia and sulfur notes represent a controversial aroma class in cannabis breeding, characterized by pungent, chemically-forward scent profiles. These aromas are commonly associated with certain phenotypes within lineages like Dog Shit and select Skunk crosses, where volatile sulfur compounds and nitrogen-based terpene derivatives create distinctive, sharp odors. Breeders working in this category typically encounter these notes as byproducts of specific microbial activity during cultivation or as expressions of recessive genetic traits. Documentation of ammonia notes remains anecdotal in many cases, as precise chemical analysis of these volatile compounds in cannabis is still developing. These aromas are often polarizing—some growers deliberately select for them as markers of potency or vigor, while others work to minimize them through breeding choices.

Breeders occasionally select for or against ammonia-sulfur phenotypes depending on their target profile. In some landrace and heirloom lines, these notes appear as stress-response markers or indicators of specific terpene biosynthesis pathways, making them useful genetic markers for phenotype identification.