--- title: "Heirloom Seeds: What They Are and Why They Matter" url: https://waronfood.org/homestead/heirloom-seeds/ category: homestead type: article status: stable published: 2026-10-07 last_updated: 2026-10-07 summary: "Heirloom seeds are old open-pollinated varieties that grow true from saved seed. Here's how they compare with hybrids and GMOs, and why that matters for seed saving." description: "Heirloom seeds explained: how heirloom, open-pollinated, F1 hybrid and GMO seeds differ, which you can save, and where to find heirloom varieties." keyword: "heirloom seeds" attribution: "War on Food (waronfood.org)" --- # Heirloom Seeds: What They Are and Why They Matter > Heirloom seeds explained: how heirloom, open-pollinated, F1 hybrid and GMO seeds differ, which you can save, and where to find heirloom varieties. ## Key takeaways - Heirloom seeds are open-pollinated varieties with a long history; there is no single legal definition. - Open-pollinated seed grows true to type if you prevent cross-pollination, so you can save and replant it. - F1 hybrid seed is bred from two parent lines and usually won't grow true from saved seed. - GMO seed is essentially not sold to home gardeners; the one notable exception is a genetically engineered purple tomato. - Seed Savers Exchange, seed libraries and local swaps are good sources of heirloom varieties. Heirloom seeds come from open-pollinated plant varieties that have been grown and passed down for generations, often for flavor, hardiness or family history. Because they're open-pollinated, you can save seed from heirloom plants and grow the same variety next year, as long as you prevent cross-pollination. Hybrid (F1) seed usually won't grow true. Seed packets carry a lot of labels: heirloom, open-pollinated, F1, non-GMO, organic. Some of them matter a lot if you plan to save seed. Others matter less than the marketing suggests. ## What are heirloom seeds? An heirloom is an old open-pollinated variety that people have kept going on purpose. University of Illinois Extension describes heirlooms as a special kind of open-pollinated plant, usually passed down through generations because of a valuable trait such as taste or color. There's no legal definition, so "heirloom" on a packet isn't regulated. Cutoffs vary. UMass Extension says most experts count varieties that predate 1951, the year the first hybrid vegetables from inbred lines were introduced. Others use a 50-year rule or require a documented family or community history. Well-known heirlooms include 'Brandywine' and 'Cherokee Purple' tomatoes, 'Kentucky Wonder' pole beans and 'Black Seeded Simpson' lettuce. Seed Savers Exchange itself grew from two family heirlooms. Its founders received Grandpa Ott's morning glory and the 'German Pink' tomato from Diane Ott Whealy's grandfather, whose parents had brought the seeds from Bavaria to Iowa in 1884. ## Heirloom vs open-pollinated vs hybrid vs GMO | Type | How it's made | Grows true from saved seed? | Good for seed saving? | |---|---|---|---| | Open-pollinated | Pollinated naturally by insects, wind, birds or the plant itself; stable genetics | Yes, if isolated from other varieties of the same species | Yes | | Heirloom | An open-pollinated variety with a long history of being passed down | Yes, if isolated | Yes | | F1 hybrid | A deliberate cross between two specific parent lines | Usually not; offspring vary | No | | GMO / genetically engineered | Genes changed or added in a lab | Depends; seed may be patented or licensed | Generally not an option for home gardeners | ### Open-pollinated Open-pollinated varieties have stable genetics. Seed saved from them produces plants like the parent, as long as no pollen from a different variety of the same species got in. Every heirloom is open-pollinated, but not every open-pollinated variety is an heirloom. Plant breeders still release new open-pollinated varieties. ### Hybrid (F1) An F1 hybrid comes from crossing two specific parent lines. The first generation is uniform and often vigorous, disease resistant or high-yielding. That's why many market growers and home gardeners choose hybrids. The catch is the next generation. The UConn Home & Garden Education Center explains that offspring of F1 hybrids aren't guaranteed to have the same traits as the original plant. Illinois Extension calls hybrids "usually bad for seed saving": you'll need to buy new seed every year. Hybrid doesn't mean genetically engineered. It's conventional plant breeding, the same thing that happens when two varieties cross in a garden, done on purpose. ### GMO Genetically engineered (GMO) seed is sold to commercial farmers, not to home gardeners. The UConn center notes that only one GMO product is available to home gardeners: a purple tomato engineered with genes from snapdragons. According to AgNavigator, it went on sale online in the US in early 2024, sold in small, high-priced packets. So a "non-GMO" label on a vegetable seed packet is true but not very informative. Nearly all home garden seed is non-GMO, heirloom or not. If you want to save seed, the useful question is whether the seed is open-pollinated or hybrid. **Tip:** Look for "OP" (open-pollinated) or "heirloom" on the packet if you plan to save seed. "F1" or "hybrid" means buy fresh seed each year. ## Why heirloom seeds matter for seed saving If you want a garden that keeps going without buying seed every spring, you need open-pollinated varieties. Heirlooms are the best-known group. Saving their seed has some practical benefits: - **You keep varieties you love.** Many heirlooms aren't sold widely, and once a company drops one, saved seed may be the only source. - **Local adaptation.** If you save seed from your best plants year after year, your strain can slowly adapt to your soil, climate and pests. - **Lower costs.** After the first packet, the seed is free. Not every heirloom is easy to save. UMass Extension points out that squash, pumpkins and brassicas such as broccoli and cabbage cross-pollinate readily. Potatoes and garlic are propagated from tubers and cloves, not seed. Start with self-pollinating crops. [Seed saving basics](https://waronfood.org/homestead/seed-saving-basics/) covers which ones and how far to separate varieties. ## Heirloom seeds and food sovereignty Seeds are where a food system starts. A gardener who can save seed has a little more control over what they grow. Communities that keep their own varieties going hold onto crops suited to their land and food traditions. That connects to *food sovereignty*, the idea that people should have a say in how their food is produced. Our [food security and food sovereignty](https://waronfood.org/articles/food-security-and-food-sovereignty/) explainer covers it. Validating that value doesn't mean hybrids or plant breeders are the enemy. Hybrids solve real problems for growers, and many gardeners grow both. The point is choice. Keeping open-pollinated seed alive keeps that choice open. ## Where to get heirloom seeds - **Seed Savers Exchange.** A nonprofit founded in 1975 near Decorah, Iowa. It says it holds about 20,000 varieties, the nation's largest nongovernmental seed bank of its kind. It sells seed and runs a member exchange. - **Regional seed companies.** Smaller companies often focus on heirloom and open-pollinated varieties suited to their region. Regional seed may perform better in your climate. - **Regular catalogs and garden centers.** Mainstream retailers now carry many heirlooms. Check for "heirloom" or "OP" on the packet. - **Seed libraries.** Many public libraries lend seed packets, with patrons asked to return saved seed after harvest. State seed laws affect how they operate. See [seed saving basics](https://waronfood.org/homestead/seed-saving-basics/). - **Seed swaps.** Garden clubs and extension master gardener programs often host swaps in late winter. Once you have your seeds, a good first project is [saving tomato seeds](https://waronfood.org/homestead/save-tomato-seeds/). If you're new to all of this, start with [homesteading for beginners](https://waronfood.org/homestead/beginners/). Buying heirloom produce at a farmers market is another way to find varieties worth growing; the [local food hub](https://waronfood.org/local-food/) can help. ## FAQ **Are heirloom seeds better than hybrid seeds?** Not automatically. Heirlooms can be saved and replanted and are often chosen for flavor or history. Hybrids often offer disease resistance, uniformity and yield. Many gardeners grow both. **Are heirloom seeds non-GMO?** Yes. Heirlooms are older open-pollinated varieties, not genetically engineered. But 'non-GMO' on a home seed packet tells you little, since nearly all home garden seed is non-GMO anyway. **Can you save seeds from hybrid plants?** You can, but the plants usually won't match the parent. University of Illinois Extension notes that seed from hybrids usually doesn't look like the parent plant, so hybrids are poor choices for seed saving. **How old does a variety have to be to count as an heirloom?** There's no official cutoff. UMass Extension says most experts use varieties predating 1951, when the first hybrid vegetables from inbred lines were introduced. Others use 50 years or a documented family history. **Where can I get heirloom seeds?** From Seed Savers Exchange and other specialty seed companies, regular seed catalogs and garden centers, local seed libraries, and seed swaps run by garden clubs or extension master gardeners. ## Sources 1. [University of Illinois Extension — How to Save Seeds (PDF)](https://extension.illinois.edu/sites/default/files/how_to_save_seeds_062021.pdf) 2. [UMass Amherst Extension — Heirloom Vegetable Varieties](https://www.umass.edu/agriculture-food-environment/home-lawn-garden/fact-sheets/heirloom-vegetable-varieties) 3. [UConn Home & Garden Education Center — Heirloom vs Hybrid: An Age-Old Garden Debate](https://homegarden.cahnr.uconn.edu/2025/01/11/heirloom-hybrid-debate/) 4. [Seed Savers Exchange — About](https://seedsavers.org/about/) 5. [AgNavigator — First genetically modified food crop becomes available to home gardeners in the US](https://www.agnavigator.com/Article/2024/02/07/First-genetically-modified-food-crop-becomes-available-to-home-gardeners-in-the-US/) --- Cite as: [Heirloom Seeds: What They Are and Why They Matter](https://waronfood.org/homestead/heirloom-seeds/), War on Food (waronfood.org), last updated 2026-10-07.