Open Pollinated Varieties

Open Pollinated Varieties (OPVs) are cannabis genetics that reproduce through uncontrolled pollination in growing environments, allowing natural crossing between male and female plants. Unlike feminized or stabilized lines, OPVs maintain genetic diversity across generations and can produce both male and female offspring. Historically, many landrace and heirloom cannabis populations were propagated as open pollinated stock, preserving regional trait expression. Breeders working with OPVs value the genetic variability they generate, which supports selection for desired characteristics across multiple growing cycles. Seed-saving from OPV plants is standard practice, though offspring may show phenotypic variation. OPVs remain foundational in breeding programs seeking to establish new stabilized lines or maintain open-source germplasm.

Breeders use OPVs as breeding foundations because uncontrolled pollination naturally generates phenotypic diversity, enabling systematic selection for stability, vigor, or specific traits. OPV populations are essential for creating new inbred lines or establishing landrace preservation projects without feminization technology.