Saving vegetable seeds at home

Last reviewed September 2026 · written from public-domain USDA/NOAA data and Cooperative Extension references — see how we source data

Illustration of home-saved vegetable seed: a glass jar of colourful dried beans, a split bean pod, labelled paper seed envelopes for tomato and bean, and a plate of tomato seeds drying.

Saving your own seed costs nothing but a little attention at the end of the season, and it lets you keep a variety going year after year. Not every crop is a good candidate, and hybrids in particular need a different approach.

Open-pollinated versus hybrid

Hybrid (F1) seed will not "breed true" — the next generation is unpredictable and usually disappointing. Only open-pollinated and heirloom varieties reliably grow into the same plant you started with, so check the seed packet or catalog before you plan to save from a crop.

Easiest crops to start with

Self-pollinating crops carry the least risk of accidental cross-breeding with a neighboring variety: tomatoes, beans, peas and lettuce are the standard beginner choices.

Which seeds to save first, and how long they keep

Easy: Tomatoes, beans, peas, lettuceSelf-pollinating - rarely cross, so a few feet between varieties is enough.

Moderate: Peppers, cucumbers, squash, melonsBees cross varieties of the same species - grow one variety or hand-pollinate and bag the flowers.

Advanced: Carrots, beets, onions, cabbage family, cornBiennials that seed in year two, or wind-pollinated corn that needs large isolation distances.

TYPICAL SEED LIFE (YEARS)

Cucumber5

Melon5

Tomato4

Squash4

Beet4

Cabbage family4

Bean3

Pea3

Lettuce3

Carrot3

Pepper2

Spinach2

Corn2

Onion1

Parsnip1

Seed life is a typical figure for seed stored cool, dark and dry in an airtight jar; well-stored seed often lasts longer, while seed kept in a warm, humid shed may fail sooner. A ten-seed germination test tells you for certain.

Crops that cross

Insect-pollinated crops cross freely between varieties of the same species. Every summer squash, zucchini, many pumpkins and acorn squash belong to one species and will cross with each other; broccoli, cabbage, kale, cauliflower and Brussels sprouts are all one species too.

To keep them true, grow only one variety of each species, or hand-pollinate: tape a female flower shut the evening before it opens, pollinate it next morning with a male flower of the same variety, and tape it shut again. Peppers mostly self-pollinate but bees cross them - bag a few flowers with fine mesh before they open.

Choose the plants to save from

Save from your healthiest, most typical plants - not the first or the single biggest fruit. Pick fully ripe fruit: tomatoes and cucumbers past eating ripeness, beans and peas with dry, rattling pods.

Take seed from several plants rather than one, so the variety keeps its genetic range and does not weaken over the years.

Wet-seed versus dry-seed processing

Tomatoes and cucumbers need their seed fermented in its own pulp for a few days to remove a germination-inhibiting gel coating, then rinsed and dried. Beans, peas and lettuce are simpler — leave pods or seed heads on the plant until fully dry and brittle, then thresh out the seed.

Storing it

Seed must be completely dry before storage or it molds. Keep it in a paper envelope, labeled with variety and year, inside an airtight jar in a cool, dark place. Most vegetable seed stays viable for two to five years stored this way; onions and parsnips are shorter-lived and are best used within a year.

Biennials need a second year

Carrots, beets, onions, leeks, cabbage and chard only flower in their second year. They have to survive a winter - in the ground under mulch, or dug and stored - and be replanted in spring to set seed. That makes them a project for your second or third year of seed saving.

Check it before you rely on it

Before sowing saved seed, roll ten seeds in a damp paper towel inside a plastic bag and keep it warm for a week. Seven or more sprouting means good seed; fewer means sow more thickly or replace it.

Common questions

Can I save seeds from store-bought tomatoes?

You can, but many supermarket tomatoes are hybrids, so the plants will not match the fruit you ate. Heirloom tomatoes from a farmers market are a better bet. Ferment and dry the seed the same way as your own.

How long do saved vegetable seeds last?

Stored cool, dark and dry, most keep for two to five years. Tomatoes, cucumbers and melons are among the longest-lived; onions, leeks and parsnips are best used within a year. A germination test tells you for sure.

Do tomato seeds need to be fermented?

It is strongly recommended. Leaving the seeds in their pulp for two to four days removes the gel coating that stops them sprouting and helps control some seed-borne diseases. Rinse well and dry on a plate, not a paper towel they will stick to.

Why did my saved seeds not grow true to type?

Either the parent was a hybrid, or it crossed with another variety of the same species nearby. Beans, peas, lettuce and tomatoes rarely cross; squash, cucumbers, corn and the cabbage family cross easily.