What Is an Heirloom Seed?
An heirloom seed is the seed of an open-pollinated plant variety that has been passed down, largely unchanged, for many generations, often 50 years or more. Because heirlooms are open-pollinated rather than hybrid, they grow "true to type," meaning the seeds you save from one plant produce plants very much like the parent the next season. Gardeners value heirlooms for their distinct flavors, colors, and history, and for the ability to save and replant their seeds year after year. Heirloom is not the same as organic, and heirloom seeds are not genetically modified; the term is about how the variety is bred and maintained.
Open-pollinated and true to type
The defining feature of an heirloom is that it is open-pollinated, meaning it is pollinated naturally by wind, insects, or self-pollination, and its offspring stay stable from one generation to the next. Save seeds from an heirloom tomato and, as long as it did not cross with a different variety, next year's plants will closely match this year's. That stability is what let families and communities keep a favorite variety alive for decades by saving seed each season, which is where the name "heirloom" comes from.
Heirloom versus hybrid
Hybrid seeds, often labeled F1, are made by deliberately crossing two different parent varieties to combine specific traits like uniform size, disease resistance, or high yield. The first generation performs well, but seeds saved from a hybrid do not come true; they revert to a mix of the parents, so gardeners buy fresh hybrid seed each year. Heirlooms trade some of that uniformity and built-in disease resistance for flavor, variety, and the freedom to save your own seed. Many gardeners grow both, choosing heirlooms for taste and seed saving and hybrids for reliability.
Heirloom, open-pollinated, organic, and GMO
These labels answer different questions. All heirlooms are open-pollinated, but not every open-pollinated variety is old enough to be called an heirloom. "Organic" describes how the seed or plant was grown, not its genetics, so a seed can be heirloom and organic, or heirloom and conventional. And heirloom seeds are not genetically modified; GMO seeds are created in a lab and are generally not sold to home gardeners at all. In short, heirloom is about heritage and breeding, organic is about growing practices, and GMO is a separate category.
Heirloom seeds to try from Madeline's
Five colors of open-pollinated sweet peppers.
Hot and sweet open-pollinated peppers.
Six heirloom melon and cantaloupe varieties.
Browse more seeds in the Garden collection.
Frequently asked questions
- What makes a seed an heirloom?
- It is an open-pollinated variety that has been grown and saved, largely unchanged, for many generations, commonly 50 years or more. Because it is open-pollinated, saved seeds grow true to type, closely matching the parent plant.
- Are heirloom seeds the same as organic seeds?
- No. Heirloom describes the variety's heritage and breeding, while organic describes how the seed or plant was grown. A seed can be heirloom and organic, or heirloom and conventionally grown.
- Are heirloom seeds genetically modified?
- No. Heirloom seeds are not GMO. They are traditional open-pollinated varieties. GMO seeds are created in a lab and are generally not sold to home gardeners.
- Can I save seeds from heirloom plants?
- Yes, which is one of their main appeals. As long as the plant did not cross with a different variety, seeds saved from an heirloom will grow plants like the parent the following season.
- Should I grow heirloom or hybrid seeds?
- It depends on your goals. Heirlooms are prized for flavor, diversity, and seed saving. Hybrids offer more uniformity and often better disease resistance and yield, but their saved seed does not come true. Many gardeners grow both.