Open-Pollinated
A variety pollinated by wind, insects, or other natural means, whose offspring reliably reproduce the parent's characteristics when grown under similar conditions. Seeds from open-pollinated varieties can be saved and replanted.
Open-pollinated (OP) varieties are pollinated by natural means - wind, insects, or self-pollination within the same variety - without controlled crossing between genetically different lines. The defining characteristic: seed saved from an open-pollinated variety produces offspring that look and grow like the parent plant. The variety breeds true.
Why It Matters for Seed Saving
Open-pollinated status is what makes seed saving practical. When you save tomato seed from a favorite OP variety and plant it next year, you get the same tomato. When you do the same with an F1 hybrid, you get unpredictable results. Every heirloom variety is open-pollinated; not every OP variety is an heirloom.
Self-Pollinating vs. Cross-Pollinating OP Varieties
Two types of open pollination exist:
Self-pollinating: pollen transfers within the same flower or between flowers of the same plant. Tomatoes, peppers, lettuce, and beans are primarily self-pollinating, which makes seed saving from these crops reliable and simple - the variety doesn’t cross with neighboring plants.
Cross-pollinating: pollen transfers between plants, carried by wind or insects. Corn, squash, cucumbers, and brassicas cross-pollinate freely. To save true-to-type seed from cross-pollinating OP varieties, you need either isolation (growing only one variety of that species in the area) or manual pollination control. Failing to isolate varieties means your saved seed is a cross between whatever was blooming nearby.
Stability and Selection
Open-pollinated varieties are not perfectly static. Each generation, small natural variations occur. Seed savers who consistently select the best-performing plants for seed - largest fruits, earliest maturity, best disease resistance - gradually improve the variety for their specific conditions. This is how regionally adapted landrace varieties develop over decades.
Commercial OP varieties are more genetically uniform than landrace varieties but less so than F1 hybrids. Some variation from plant to plant is normal and expected.
OP vs. Heirloom vs. Hybrid
- All heirlooms are open-pollinated
- Not all OP varieties are heirlooms - new OP varieties are developed and introduced regularly
- No hybrid is open-pollinated (by definition - hybrids are created by controlled crossing)
A newly released OP variety from a plant breeder who stabilized it over 8 generations is open-pollinated but not an heirloom. After 50 years of use, it might qualify as heirloom by common usage.
Choosing OP Over Hybrid
The main reasons to choose OP varieties:
- Seed saving - reduce ongoing seed costs
- Genetic diversity - not dependent on a single breeding company’s proprietary lines
- Adaptability - OP varieties can be selected over time to fit your specific conditions
- Flavor - many classic OP tomatoes and other crops have better flavor than commercial hybrids
The main trade-offs: less disease resistance than modern hybrids in many species, less yield uniformity, and more variation plant to plant.