Seed Banking and Saving

Only save seeds from open-pollinated (OP) and heirloom varieties—these breed true to type, meaning their offspring will match the parent plant. Hybrid seeds (marked F1 or F2) will not produce viable offspring matching the parent; their second generation reverts to inferior parent traits. Check seed packets before planting. Priority crops for seed saving: tomatoes, beans, squash, lettuce, peppers, carrots, onions, and grains like wheat and corn. Avoid hybrids entirely for your seed bank.

Hybrid seeds produce non-viable or inferior offspring. Do not waste effort or storage space on hybrid varieties.

Allow seed pods, fruits, and heads to fully mature on the plant before harvesting. Seeds are ready when pods are dry, papery, and begin to split naturally, or when fruit is fully ripe and soft. For beans, leave pods on the plant until they rattle when shaken. For tomatoes, ferment seeds in water for 3–5 days to remove the gelatinous coating, then rinse thoroughly. For squash and melons, scoop seeds from mature fruit and rinse immediately. For grains, harvest entire heads when golden-brown and brittle.

Seeds harvested too early lack viable embryos and will not germinate. Over-mature seeds on wet plants risk mold and rot.

Spread harvested seeds in a single layer on clean, dry surfaces (paper plates, trays, or cloth) in a warm, airy location away from direct sunlight. Dry for 2–4 weeks until seeds are hard and brittle—break or crush a test seed to confirm complete drying with no moisture inside. Use fans to circulate air if humidity is high. Moisture is the enemy of long-term viability; any residual water will trigger premature germination or mold growth during storage.

Damp seeds will rot or germinate prematurely in storage, destroying viability. Verify complete dryness before sealing containers.

Transfer dried seeds to airtight containers: glass jars with tight seals, mylar bags with oxygen absorbers, or food-grade plastic containers. Label each container with crop name, variety, and harvest date. Store in a location that is cool (ideally 32–40°F / 0–4°C, but room temperature 50–60°F is acceptable), dark (sunlight degrades viability), and dry (relative humidity below 50%). A root cellar, basement, pantry, or refrigerator works well. Add silica gel desiccant packets to containers if humidity is unpredictable. Properly stored seeds remain viable for years: tomatoes and beans 3–5 years, squash 4–6 years, onions 1–2 years, carrots 3–4 years, grains 5–10 years.

Exposure to light, heat, or humidity dramatically reduces viability. Check containers monthly for signs of condensation or pest damage.

Store seeds away from grain-eating insects (weevils, moths, beetles) and rodents. Use sealed, hard-sided containers—glass jars with gasket seals are superior to cardboard. If pest pressure is high, freeze seeds for 48 hours before storage to kill any larvae, then allow them to reach room temperature before sealing (moisture will condense otherwise). Keep food stores and animal feed separate from seeds. Maintain inventory records to track what you have, when seeds were harvested, and anticipated viability expiration. Periodically conduct germination tests: place 10–20 seeds on damp paper towels in a warm location and count how many sprout; if fewer than 80% germinate, that variety is nearing end-of-life.

Rodents and insects can destroy months of saved seeds. Use hard containers, not cloth or paper bags. Test viability every 2–3 years.

Estimate seed needs based on family size and caloric/nutritional goals. For vegetables: 1–2 packets (enough for 50–100 plants) of tomatoes, beans, and squash per person annually. For grains: 1–2 kg of seeds yields 15–30 kg of grain (enough to feed one person for 1–2 months). For greens: 50 g each of lettuce, spinach, and kale seeds. Build redundancy—save 2–3 seasons' worth of seeds to buffer against crop failure or pest loss. Prioritize high-calorie crops: grains, beans, squash, and root vegetables. Diverse variety selection reduces risk of total crop failure from disease or pest outbreaks.

Inadequate seed quantities will not sustain your household. Calculate needs realistically and plan for crop failures by maintaining surplus.

Connect with neighbors, community gardens, and local farmers to exchange seeds, share knowledge, and maintain genetic diversity. Document the origin, characteristics, and growing conditions for each variety—this information becomes invaluable as communities adapt crops to local conditions. Establish simple trading protocols: trade seed for seed, or record exchanges in a shared notebook. Protect your network from dependence on external sources; if a network member stops saving seeds, grow their saved varieties yourself to maintain them. Create a community seed library or storage location (if secure from theft or environmental damage) for shared access during emergencies.

Seed networks are valuable only if participants actively save and share. Neglected networks collapse quickly when members leave or stop participating.