How Do I Save Seeds from My Garden to Sow Next Year?

Saving seeds closes the loop on your growing year — instead of buying the same varieties again, you harvest seed from your best plants, dry and store it correctly, and sow it the following spring. It costs nothing, preserves varieties you love, and over time you select plants increasingly adapted to your specific conditions. It is one of the most satisfying skills in gardening.

Which Plants Are Easiest to Save Seed From?

Open-pollinated (OP) varieties are the essential starting point — these breed true from seed, meaning the offspring will reliably resemble the parent plant. Avoid saving seed from F1 hybrid varieties (see the F1 hybrid guide for why). The easiest vegetables for seed saving include:

• Tomatoes — self-pollinating; seed from a single plant breeds true
• Beans and peas — self-pollinating; leave pods to dry on the plant
• Lettuce — allow to bolt; harvest seed heads when brown and papery
• Courgettes and squash — must be isolated from other varieties to prevent crossing
• Peppers and chillies — self-pollinating; extract seed from ripe fruits

Harvesting Seeds at the Right Time

Seeds must be fully mature before harvest. For tomatoes, let the fruit fully ripen — even over-ripen slightly. For peas and beans, leave pods to turn yellow-brown and dry on the plant. For lettuce and brassicas, wait for the seed heads to turn papery and brown. Harvest on a dry day if at all possible — wet seeds are far harder to dry properly and more prone to mould during storage.

Cleaning and Drying Seeds

Tomato seeds need fermentation to remove the germination-inhibiting gel coat: scoop seed and gel into a jar of water, leave at room temperature for 3–4 days until the viable seeds sink and mould appears on top. Rinse, drain, and spread on a non-stick surface (a ceramic tile or waxed paper) to dry. For dry seeds (peas, beans, lettuce), simply separate seeds from pods or seed heads and spread in a single layer to dry for 2–3 weeks in a warm, airy spot.

Storing Saved Seeds

Completely dry seeds stored in sealed paper envelopes inside an airtight container, placed in a cool, dark location, will remain viable for 2–5 years depending on the species. Avoid plastic bags for long-term storage — any residual moisture is trapped and causes deterioration. Label everything: crop, variety, year of harvest. Within a few years you will have a seed library that is worth more than a seed catalogue.