Moisture Vapor Transmission

Moisture vapor transmission (MVT) is not a terpene, but rather a physical property relevant to cannabis seed storage and preservation. It describes the rate at which water vapor passes through packaging materials, affecting seed viability over time. In cannabis genetics work, controlling MVT is critical for maintaining seed longevity and genetic stability during storage. Breeders and seed banks use low-MVT packaging—such as vacuum seals, mylar, or specialized seed vaults—to slow moisture exchange and preserve germination rates across generations. Understanding MVT helps explain why seed storage conditions and container choice directly impact the preservation of rare or legacy strain genetics.

Seed preservation programs rely on MVT control to maintain genetic purity and viability of foundation lines. Breeders working with limited stock or heirloom cultivars prioritize low-MVT storage to extend the usable life of seeds between reproduction cycles.