Seed Saving

Why This Matters

Seeds are the most critical resource in post-collapse agriculture. Without a reliable seed supply, you cannot farm. Commercial seed stocks will be exhausted within 1-2 seasons. The ability to save, select, and store your own seeds transforms you from a seed consumer into a seed producer — making your community self-sufficient in food production indefinitely. Every lost variety is a lost tool for survival.

What You Need

Harvesting tools:

• Small cloth or paper bags for seed collection
• Scissors or sharp blade for cutting seed heads
• Baskets or trays for drying

Processing tools:

• Fine-mesh screen or loosely woven cloth (for cleaning)
• Bowls for water-separation and fermentation
• Flat surface for drying (stone slab, wooden board, clean cloth)
• Mortar and pestle or two flat stones (for gentle threshing)

Storage supplies:

• Airtight containers — clay pots with sealed lids, glass jars, tightly-woven baskets lined with hide
• Desiccant — dry rice, wood ash, or charcoal
• Labels — scratched bark, carved sticks, or marked stones

---

Understanding Seed Basics

Open-Pollinated vs. Hybrid

This distinction is the most important concept in seed saving.

Open-pollinated (OP) varieties produce offspring that are true to type — the seeds grow into plants identical to the parent. These are the varieties you want. All heirloom varieties are open-pollinated. All wild plants are open-pollinated. Most pre-industrial crop varieties are open-pollinated.

Hybrid (F1) varieties are crosses between two different parent lines. They produce vigorous plants in the first generation, but seeds saved from hybrids will produce wildly variable offspring in the second generation — some good, many terrible. If your only seed source is hybrid varieties, you can still grow them, but you will need 3-5 generations of careful selection to stabilize the traits you want.

Identifying Open-Pollinated Seeds

If you are raiding a garden center or seed vault: any variety with a name like “Brandywine,” “Cherokee Purple,” or any other historical/traditional name is almost certainly open-pollinated. Anything labeled “F1” or “hybrid” is not. When in doubt, save seeds anyway — even unstable genetics beat no seeds at all.

Self-Pollinating vs. Cross-Pollinating Crops

Self-pollinators fertilize themselves before flowers even open. Saving seeds from these is easy — they breed true with minimal effort.

• Tomatoes, peppers, beans, peas, lettuce, wheat, barley, oats, rice

Cross-pollinators require pollen from a different plant, carried by wind or insects. Saving pure seed requires preventing unwanted crosses.

• Corn, squash, cucumbers, brassicas, beets, carrots, onions, sunflowers

Pollination Type	Difficulty	Isolation Needed
Self-pollinating	Easy	None (or 3-10 m for absolute purity)
Insect cross-pollinating	Moderate	400 m-1.5 km between varieties, or hand pollination
Wind cross-pollinating	Difficult	1-3 km between varieties, or bagging

---

Selecting Which Plants to Save From

This is where seed saving becomes crop improvement. The plants you choose to save seed from determine the future of your food supply.

The Cardinal Rule: Save from the Best

Mark your best plants early in the season — do not wait until harvest to decide. Look for:

• Vigor: Strongest growth, darkest green leaves, tallest (or most compact, depending on crop)
• Disease resistance: Plants that stayed healthy when neighbors got sick
• Earliness: Plants that matured first (critical in short growing seasons)
• Yield: Most fruit, largest roots, heaviest grain heads
• True to type: Plants that look like they should for the variety

Never save seed from:

• The last fruit left on the vine (that is the runt)
• Diseased plants (many diseases transmit through seeds)
• The most convenient plant — choose the best, even if it means walking to the far end of the garden

Population Size — Avoiding Inbreeding

Saving seed from too few plants causes inbreeding depression — declining vigor, reduced yields, and increased disease susceptibility over generations.

Crop Type	Minimum Plants to Save From	Ideal
Self-pollinating (beans, tomatoes)	5-10	20-50
Cross-pollinating (corn, squash)	20-50	100-200
Biennial (carrots, beets, cabbage)	20-50	80-100

For corn, saving from fewer than 200 plants causes noticeable decline within 3-4 generations. If you have a small plot, trade seeds with neighboring communities to maintain genetic diversity.

---

Dry Seed Processing

Used for: beans, peas, grains, lettuce, onion, most flowers, herbs.

Step 1: Harvest Timing

Leave seeds on the plant as long as possible. Seeds are ready when:

• Seed pods are brown, dry, and papery
• Seeds rattle inside pods when shaken
• Grain heads have turned golden and stems are dry
• Seeds are hard and resist denting with a fingernail

If rain or frost threatens, cut entire plants and hang upside down under cover to finish drying.

Step 2: Threshing

Separate seeds from pods, husks, and stems.

Small quantities: Rub pods between hands over a bowl or cloth. Shell beans and peas individually.

Large quantities: Place dried seed heads in a cloth bag and beat against a hard surface. Or spread on a clean hard surface and walk on them with soft-soled shoes. Or flail with a stick.

Step 3: Winnowing

Separate seeds from chaff (lightweight debris).

1. Pour the threshed material slowly from one container to another in a light breeze
2. Heavy seeds fall straight down into the lower container
3. Light chaff blows away
4. Repeat until seeds are clean

No-wind alternative: Blow gently across a flat tray of seeds, angling the tray slightly. Chaff tumbles off the edge; seeds stay.

The Breath Test

For very small seeds, hold a pinch near your lips and blow gently. Watch how the seeds and chaff separate. Adjust your breath strength until you can cleanly sort them.

---

Wet Seed Processing

Used for: tomatoes, cucumbers, melons, squash, peppers (any seed embedded in wet fruit flesh).

The Fermentation Method (Tomatoes, Cucumbers)

Fermentation removes the germination-inhibiting gel coat and kills many seed-borne diseases.

1. Cut ripe fruit and squeeze seeds with surrounding gel into a bowl
2. Add equal amount of water
3. Cover loosely (cloth or leaf, not airtight) and set in a warm place
4. Stir once daily
5. After 2-4 days, a white mold forms on top — this is correct and expected
6. When mold covers the surface, add water and stir vigorously
7. Good seeds sink to the bottom; dead seeds, pulp, and mold float
8. Pour off the floating debris
9. Repeat adding water and pouring until only clean seeds remain at the bottom
10. Spread seeds on a non-stick surface (NOT paper — they will stick permanently) — use a ceramic plate, glass, or screen
11. Dry in a well-ventilated, shaded area for 5-7 days, stirring daily to prevent clumping

Direct Wash Method (Squash, Melons, Peppers)

These seeds do not need fermentation.

1. Scoop seeds from ripe fruit
2. Place in a bowl of water and rub to remove flesh
3. Good seeds sink; debris floats
4. Pour off floating material
5. Spread clean seeds to dry as above

Ripeness Matters

For seed-saving purposes, fruit must be fully ripe — often past the point you would eat it. Tomatoes should be soft and deep-colored. Cucumbers should be yellow and swollen. Squash should be hard-shelled with dry stems. Peppers should be fully colored (red, orange, or yellow, depending on variety).

---

Seed Drying for Storage

Proper drying is the single most important factor in seed longevity. Moisture is the enemy.

Target Moisture Content

Seeds should reach 6-8% moisture content for storage. Testing without instruments:

The snap test (beans, large seeds): Bend a seed. It should snap cleanly in half, not bend or dent. If it bends, it is too moist — continue drying.

The bite test (grain seeds): Bite a seed. It should crack sharply, not deform or feel chewy.

The fingernail test: Press a fingernail into the seed. It should not leave an impression.

Drying Methods

• Air drying: Spread in a single layer on screens, trays, or plates in a warm, dry, well-ventilated area out of direct sun. Turn daily. Takes 7-14 days depending on humidity.
• Never use heat above 35°C — this kills seed embryos. No ovens, no direct sun on dark surfaces.
• Silica gel equivalent: Place seeds in a sealed container with an equal volume of dry rice, wood ash, or crushed charcoal for 7-10 days. These desiccants pull moisture from seeds.

---

Seed Storage

The Three Enemies of Stored Seeds

1. Moisture — activates enzymes that consume seed energy reserves
2. Heat — accelerates deterioration (every 5°C increase halves seed life)
3. Light — triggers premature germination signals

Storage Conditions

Quality Level	Conditions	Seed Life Extension
Minimum	Room temperature, dry, dark	1-3 years
Good	Cool cellar/underground, sealed container with desiccant	3-7 years
Excellent	Near-freezing, airtight, very low moisture	5-15+ years

The “100 Rule”: Temperature (°F) + relative humidity (%) should equal less than 100 for good storage. Example: 60°F + 30% RH = 90 (good). 80°F + 60% RH = 140 (seeds will deteriorate quickly).

Storage Containers

Best to worst:

1. Glazed ceramic jar with wax-sealed lid
2. Glass jar with tight-fitting lid
3. Metal tin with close-fitting lid
4. Tightly-woven basket lined with hide or beeswax-coated cloth
5. Cloth bag inside a sealed container

Always add a desiccant: a small cloth bag of dry rice, wood ash, or crushed charcoal. Replace desiccant annually.

Labeling

Every container must be labeled with:

• Crop name and variety
• Year harvested
• Source location (which field/plot)
• Any notable traits (early ripening, disease resistant, etc.)

Use carved sticks, scratched pottery, or charcoal on bark. Anything durable enough to last until planting time.

---

Crop-Specific Guides

Tomatoes

• Type: Self-pollinating (easy)
• Method: Fermentation (3-4 days)
• Harvest from: Fully ripe, soft fruit from the best plants
• Isolation: 3 m between varieties (sufficient for home saving)
• Seed life: 4-7 years in proper storage
• Population minimum: 5-10 plants

Beans and Peas

• Type: Self-pollinating (easy)
• Method: Dry on vine, thresh, winnow
• Harvest from: Leave pods on plant until brown and rattling
• Isolation: 3-5 m between varieties
• Seed life: 3-4 years
• Population minimum: 10-20 plants

Squash and Pumpkins

• Type: Cross-pollinating by insects (moderate difficulty)
• Method: Hand pollinate, then wash and dry seeds
• Hand pollination: Evening before: tape shut one male flower and one female flower (has swollen base). Next morning: open male, remove petals, rub pollen onto female stigma, tape female shut. Mark fruit with a tie.
• Isolation: 800 m between varieties of the same species, or hand-pollinate
• Seed life: 4-6 years
• Population minimum: 6-12 plants

Corn

• Type: Wind cross-pollinating (difficult)
• Method: Dry on stalk, hand-strip kernels
• Harvest from: Leave ears on stalk until husks are fully dry and brown
• Isolation: 1-3 km between varieties (wind-carried pollen)
• Seed life: 2-3 years
• Population minimum: 50-200 plants (critical for vigor)
• Special note: Corn inbreeds rapidly. Never save from fewer than 50 plants.

Carrots and Beets (Biennials)

• Type: Cross-pollinating, biennial (overwinter roots, flower in year 2)
• Method: Harvest roots in fall, store over winter, replant best roots in spring, collect seed from flower stalks in summer
• Isolation: 1 km between varieties
• Seed life: 2-3 years (carrots), 4-5 years (beets)
• Population minimum: 20-40 plants

Biennial Seed Saving

Biennials (carrots, beets, cabbage, onions, parsley) do not produce seed until their second year. You must overwinter the root or plant, then replant it to flower. This requires planning and storage — but it is the only way to maintain these crops long-term.

---

Seed Viability Chart

Crop	Average Seed Life (years)	Easy to Save?
Corn	2-3	Moderate (needs large population)
Beans	3-4	Very easy
Peas	3-4	Very easy
Tomatoes	4-7	Easy (ferment method)
Peppers	2-4	Easy
Squash/Pumpkin	4-6	Moderate (hand pollination)
Cucumber	5-7	Moderate
Lettuce	3-5	Easy (self-pollinating)
Carrots	2-3	Difficult (biennial)
Onions	1-2	Difficult (biennial, short-lived seed)
Wheat/Barley	2-4	Easy (self-pollinating grain)
Radish	4-5	Moderate
Cabbage	4-5	Difficult (biennial, cross-pollinates)

---

Building a Seed Bank

A community seed bank is one of the most valuable institutions you can establish. It provides insurance against crop failure and preserves genetic diversity.

Principles:

• Store seeds from every variety you grow, every year
• Keep at least 3 years of supply for each critical crop
• Trade with other communities to introduce new genetics
• Test germination rate of stored seeds each spring before planting
• Replace oldest stocks first (first in, first out)

Germination test:

1. Wrap 10 seeds in a damp cloth
2. Keep warm (20-25°C) for the species-appropriate germination time
3. Count how many sprout
4. If 8+ of 10 germinate (80%+): full viability, plant normally
5. If 5-7 germinate (50-70%): still usable, plant double density
6. If fewer than 5 germinate: use for planting but prioritize saving new seed this season

---

Common Mistakes

Mistake	Why It’s Dangerous	What to Do Instead
Saving seed from hybrid (F1) varieties	Offspring are unpredictable, often inferior	Use open-pollinated varieties exclusively
Saving from worst or most convenient plants	Breeds weakness into your seed stock	Always save from the best, healthiest, highest-yielding plants
Insufficient drying before storage	Seeds mold, rot, or sprout in storage	Dry until snap test passes, use desiccant
Storing in warm, moist, bright conditions	Rapid viability loss — seeds dead within 1 year	Cool, dark, dry, airtight containers
Too small a breeding population	Inbreeding depression — declining vigor each generation	Minimum 20 plants for cross-pollinators, trade for diversity
Not isolating cross-pollinating crops	Varieties cross, producing unexpected offspring	Isolate by distance or hand-pollinate
Saving tomato seeds without fermentation	Gel coat inhibits germination, may carry disease	Always ferment tomato/cucumber seeds 2-4 days

---

What’s Next

With a reliable seed supply secured, you can begin deliberately improving your crop varieties:

• Selective Breeding — Systematically selecting for desired traits to develop crop varieties adapted to your specific climate, soil, and needs

---

Quick Reference Card

Seed Saving — At a Glance

• Open-pollinated only — hybrids (F1) do not breed true
• Save from the best plants — mark winners early in the season
• Self-pollinators (easy): tomatoes, beans, peas, lettuce, wheat
• Cross-pollinators (need isolation): corn, squash, brassicas, carrots
• Dry seeds: leave on plant until brown/rattling, thresh, winnow
• Wet seeds: ferment 2-4 days (tomato/cucumber) or wash (squash/pepper)
• Drying target: snap test — seed breaks cleanly, does not bend
• Storage: cool + dark + dry + airtight + desiccant
• Population minimums: 5-10 (self), 20-50 (cross), 50-200 (corn)
• Test viability: 10 seeds in damp cloth, count sprouts after 7-14 days
• Seed bank rule: always keep 3 years of supply per critical crop