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Chem 91 is a legendary, clone-only cultivar that serves as a foundational pillar of modern cannabis genetics. First circulated in the early 1990s, this cultivar is widely credited as the progenitor of the Chemdawg, Sour Diesel, and many OG Kush-derived lines. Its exact genetic origin remains undocumented, contributing to its mystique, but its influence is unmistakable across fuel-forward, high-potency cultivars. Chem 91 has an abundant resin production with greasy, sticky gland heads rather than frosty “white” coverage and is defined by an aggressive, unmistakable chemical fuel aroma that set the benchmark for “gas” cultivars.
