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Herbs, Flowers & Specialty CropsSeed Saving Calendar by Crop
Seed saving works crop by crop, because each plant pollinates, ripens and dries in its own way. This calendar sorts crops into groups so you can plan isolation, harvest and storage.
Key points
- Begin with self-pollinating crops and open-pollinated varieties.
- Plan isolation by distance, timing or barriers for crops that cross.
- Harvest seed at the right stage, clean it and dry it fully.
- Store cool, dry and dark, and test germination before sowing.
Which crops are easiest to save seed from?
Self-pollinating crops, such as beans, peas, lettuce and tomatoes, are generally the easiest, because flowers pollinate themselves and crosses are less common. Start with these if you are new to seed saving. Crops that cross readily, such as squash, corn and many brassicas, need isolation or hand pollination.
Biennials, such as carrots, beets and onions, take two growing seasons to produce seed, so the calendar spans two years and winter storage or overwintering.
Why do open-pollinated varieties matter?
Saved seed from open-pollinated or heirloom varieties generally comes true to type if crossing is controlled. Seed from hybrid varieties usually does not, and offspring vary. Check the seed packet or catalog for the variety type, and note that some varieties are covered by plant variety protection or licensing terms that restrict saving. Read the terms before saving.
Save seed from many plants, not just one or two, to keep the variety healthy and diverse. Choose plants that performed well and did not bolt or succumb to disease early.
Keep a seed log for every lot. Record crop, variety, source, planting date, how many plants you saved from, isolation method, harvest date, drying method and germination test result. When something goes wrong, such as poor germination or off-type plants, the log helps you trace the cause. It also makes it easy to share seed with neighbors or a seed library with accurate information, which improves everyone's results from year to year.
How do you plan isolation?
Isolation prevents unwanted crossing through distance, timing or physical barriers. Wind-pollinated crops such as corn need larger distances than insect-pollinated ones. Extension and seed-saving organizations publish recommended distances, and these differ by crop and by whether you want commercial or home purity. Use the figures from a reliable local source.
Timing isolation means planting varieties so they flower at different times. Barriers include cages, bags or tents for hand-pollination.
- Self-pollinators: modest separation often enough.
- Insect-pollinated crossers: distance, cages or hand-pollination.
- Wind-pollinated crops: large distances or staggered flowering.
When do you harvest seed?
Harvest timing depends on seed type. Dry-seeded crops, such as beans and lettuce, are harvested when pods or seed heads are dry on the plant. Wet-seeded crops, such as tomatoes and cucumbers, are harvested from fully ripe or overripe fruit and then cleaned and dried. Pick seed only from healthy plants that show the traits you want, and label each lot at once with crop, variety and year.
Disease can travel with seed, so avoid saving seed from plants that showed obvious disease. Ask your extension office about seed-borne diseases common to your crops.
How do you clean and dry seed?
Clean off chaff and pulp, then dry seed thoroughly in a warm, airy place out of direct sun. Seed that is stored damp can mold or lose viability. Spread seed in a thin layer and stir periodically. Test for dryness by a simple method suggested by your extension office or seed-saving guide, such as whether small seeds snap rather than bend.
How should you store saved seed?
Store seed cool, dry and dark in labeled, airtight containers. Many seed-saving guides suggest keeping containers in a cool place and away from temperature swings. Check stored seed before planting with a simple germination test on a sample, and adjust your sowing amounts if germination is low. Storage life varies widely by crop, so check a reliable guide.
If you want to share or sell seed, check your state seed laws, which may require labeling or licensing. Your state department of agriculture can explain the rules.
How do you build a yearly seed saving calendar?
List your crops in three groups: self-pollinators, crossers needing isolation and biennials. Beside each, note flowering time, seed ripening time, isolation method and storage. Update it with your own dates after each season. Good records of what you saved, how and how well it grew make each year's seed better than the last.
Treat seed saving as a skill that builds over years. Start with two or three easy crops, learn their rhythm and add others as confidence grows. Share seed and notes with local gardeners, since varieties adapted to your area are worth keeping alive and sharing.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.