Moisture Dependent Microbial Activity

Moisture-dependent microbial activity refers to the growth and metabolic processes of microorganisms—bacteria, fungi, and molds—that accelerate when cannabis plant material reaches certain humidity thresholds, typically above 60–65% relative humidity. This is not a terpene itself, but rather a post-harvest and storage concern directly influenced by environmental conditions. Understanding microbial proliferation is critical for seed preservation, dried flower stability, and breeding stock maintenance. High moisture environments can degrade terpene profiles, cannabinoid potency, and genetic material viability over time. Breeders and seed banks carefully monitor storage humidity to prevent unwanted fermentation, mold colonization, and loss of chemotype integrity.

Seed preservation programs rely on controlling moisture and temperature to halt microbial activity and maintain genetic fidelity across generations. Breeders working with live plant material and clone libraries must manage humidity strictly to prevent pathogenic fungi and bacterial infections that compromise phenotype expression and breeding records.