Seed & Food Salvage

Part of Priority Salvage List

Canned food keeps you alive for months. Seeds keep you alive forever. This guide covers both: finding and assessing preserved food from ruins, and locating viable seeds that will become your agricultural future. A single packet of tomato seeds contains enough plants to feed a family for a season. A single can of beans buys you the day you need to plant them.

Finding Preserved Food in Ruins

Canned Goods Assessment

Commercially canned food is one of the most reliable salvage items. The canning process (heating to 121°C / 250°F under pressure) kills all bacteria, and the sealed environment prevents recontamination. Properly stored canned goods remain safe to eat for years beyond their expiration date — potentially decades.

Safe to eat:

• Cans with intact seals, no bulging, no deep rust, no leaks
• Dented cans — dents are cosmetic unless the dent is on the seam (the double-folded edge at top and bottom). Seam damage can break the seal.
• Cans past their “best by” date — this is a quality date, not a safety date. Nutritional content and flavor degrade, but safety remains

Do NOT eat:

• Bulging cans — bulging indicates bacterial gas production inside. This means the seal failed and bacteria (potentially Clostridium botulinum, which produces deadly botulinum toxin) are growing. Discard without opening. Do not even taste.
• Leaking cans — the seal is broken. Contents are contaminated.
• Rust-through — if you can see daylight through rust holes, the seal is broken
• Cans that spray or hiss when opened — pressure inside means gas production means bacterial activity. Discard.
• Contents that smell “off” — trust your nose. Decomposition produces distinct foul odors

Botulism

Botulinum toxin is odorless, colorless, and tasteless. It is one of the deadliest substances known. Low-acid canned foods (meats, vegetables, soups) are the primary risk. High-acid foods (tomatoes, fruits, pickles) are lower risk because acid inhibits C. botulinum growth. When in doubt, boil the contents for 10 minutes — this destroys botulinum toxin (but not the spores, so eat immediately after boiling).

Dry Staples & Bulk Food

White rice — stored dry, lasts 25-30 years. Possibly the single best calorie-per-gram salvage food. Brown rice lasts only 6-12 months due to oils in the bran.

Dried beans and lentils — last 10-30 years if kept dry. Older beans take longer to cook (soak overnight, then boil for 2-4 hours). Very old beans may never fully soften but are still nutritious.

Sugar — lasts indefinitely if kept dry. May harden into a brick but is still pure sucrose. Break or dissolve.

Salt — lasts indefinitely. Pure mineral. Absorbs moisture and clumps but never degrades.

Honey — lasts indefinitely. May crystallize (heat gently to reliquefy). Edible honey has been found in Egyptian tombs.

Flour — lasts 6-12 months in an open bag, 2-5 years in a sealed container. Goes rancid (oils oxidize) and attracts insects. Check for weevils (small dark beetles) before using. Sifting through a fine mesh removes insects and eggs.

Pasta (dried) — lasts 2-5 years in sealed packaging, longer in airtight containers. Must be dry and insect-free.

Oats — 3-5 years in sealed packaging. Steel-cut lasts longer than rolled oats.

Powdered milk — 2-10 years depending on packaging. Nonfat lasts longer than full-fat. Vacuum-sealed or nitrogen-packed lasts longest.

Cooking oil — 1-2 years unopened. Goes rancid (smells bad, tastes bad, but not acutely toxic). Rancid oil still works for cooking — flavor is unpleasant but the calories are real.

Overlooked Food Sources

Everyone raids grocery stores. Smart salvagers go where others do not:

• Vending machines — sealed packages, climate-controlled until power fails. Snacks, drinks, sometimes sandwiches. Break the glass or pry the front panel.
• Pet food — dog food and cat food are nutritionally complete for humans in an emergency. Dry kibble lasts 1-2 years. Canned pet food follows the same safety rules as canned human food.
• Livestock feed — whole corn, oats, barley, alfalfa pellets, soybean meal. All are edible by humans (though not tasty). Available in 25-50 kg bags at farm supply stores.
• Institutional kitchens — schools, hospitals, prisons, military bases, corporate cafeterias. These stock #10 cans (3 kg / 6.5 lbs each) of vegetables, fruit, sauces, and dehydrated foods. A single institutional kitchen may have weeks of food.
• Warehouses and distribution centers — follow the supply chain backward from retail. A grocery distribution warehouse contains more food than every store it serves combined.
• Restaurants — walk-in coolers (food spoils fast without power), dry storage (canned and dry goods in bulk), spice racks, cooking oils.
• Food banks and churches — often have pantries with canned goods and dry staples.
• Boats and RVs — people stock these with shelf-stable provisions. Often overlooked.

Where to Find Seeds

Commercial Seed Packets

Garden centers and hardware stores stock seed displays seasonally. A single seed rack contains dozens of vegetable and herb varieties — enough to start a comprehensive garden.

Dollar stores and discount retailers carry seed packets (often 4 for $1). Lower germination rates than premium seeds but still viable.

Farm supply stores stock seeds in bulk — pounds of corn, beans, peas, cover crops. These are field-crop quantities intended for acreage, not home gardens.

What to prioritize:

• Calorie crops: beans (dry), corn, potatoes (seed potatoes, not seeds), squash, peas
• Nutrient-dense: kale, spinach, carrots, beets, sweet potatoes
• Fast-growing: radishes (25 days), lettuce (30 days), spinach (40 days), green beans (50 days)
• Preservation-friendly: tomatoes, peppers, cucumbers (for pickling), cabbage (for sauerkraut)
• Herbs with medicinal value: chamomile, echinacea, peppermint, garlic (cloves = seeds)

Critical: Look for open-pollinated or heirloom varieties. These produce seeds that grow true to the parent plant. Hybrid varieties (marked F1) produce seeds that revert to unpredictable parent traits in the next generation. You can still plant hybrid seeds — you just cannot save seeds from the harvest and expect consistent results.

Seeds From Food

Many foods from grocery stores and kitchens contain plantable seeds:

Highly viable:

• Dried beans — any dried bean from the grocery store (kidney, pinto, black, navy, chickpea, lentil) is a viable seed. Soak and plant.
• Dried peas — whole dried peas, split peas sometimes work (splitting can damage the embryo)
• Popcorn — unpopped popcorn kernels are viable corn seeds. They grow into field corn (starchy, not sweet)
• Whole spices — coriander seeds grow into cilantro. Mustard seeds grow into mustard greens. Dill seeds, fennel seeds, cumin seeds — all viable if not irradiated or heat-treated.
• Garlic cloves — each clove is a seed. Plant pointed end up, 5 cm deep.
• Potatoes with eyes — any potato that has started sprouting is a seed potato. Cut into pieces with 1-2 eyes each.
• Onion bottoms — the root end of an onion, placed in soil, will regrow.

Sometimes viable:

• Tomato seeds — from fresh tomatoes. Ferment the gel coating off (squeeze seeds into water, let sit 2-3 days, rinse). Many grocery tomatoes are hybrids.
• Pepper seeds — from fresh peppers. Dry thoroughly before storing.
• Squash and pumpkin seeds — from mature fruits. Dry thoroughly.
• Apple/pear/stone fruit seeds — require cold stratification (60-90 days in fridge or cold soil) and will not grow true to the parent. Results are unpredictable but still produce fruit trees.

Not viable:

• Roasted or toasted seeds and nuts (heat kills the embryo)
• Seeds from highly processed foods
• Most citrus seeds (they grow but take 7-15 years to fruit and do not grow true)

Wild Seed Collection

Every weed is a potential crop ancestor. Many common “weeds” are highly nutritious:

• Dandelion — entire plant is edible (greens, roots, flowers). Seeds visible as white puffballs.
• Lamb’s quarters (Chenopodium) — one of the most nutritious greens on Earth. Related to quinoa.
• Purslane — succulent weed, high in omega-3 fatty acids. Grows in sidewalk cracks.
• Amaranth — grain crop that grows wild as “pigweed.” Seeds are tiny but very nutritious.
• Plantain (Plantago) — the weed, not the banana. Edible leaves, medicinal.
• Wild onion/garlic — grasslike plants with onion/garlic smell when crushed. If it smells like onion, it is safe.

Plant Identification

Never eat a wild plant you cannot positively identify. Many edible plants have toxic look-alikes. The “universal edibility test” (touching, lip-testing, tiny bite, waiting) is slow and unreliable. A field guide is essential. See Library & Bookstore Priorities for recommended field guides.

Seed Viability & Testing

Seed Longevity by Species

Seeds are alive. They respire slowly, consuming stored energy. Eventually, the embryo dies. But “eventually” varies enormously:

Seed Type	Viability (years, proper storage)	Notes
Onion, parsley, parsnip	1-2	Short-lived. Plant these first
Corn, pepper, spinach	2-3	Moderate life
Beans, peas, carrot, lettuce	3-5	Reliable mid-term storage
Beet, cucumber, melon, squash, tomato	4-6	Good storers
Brassicas (cabbage, broccoli, kale)	4-5	Fairly durable
Radish, turnip	4-5	Reliable
Wheat, barley, rice, oats	5-10+	Grain seeds last well
Lotus, date palm	Decades to centuries	Extreme outliers

These numbers assume cool, dry storage. Seeds left in a hot garden shed lose viability in a fraction of these times. Seeds in a freezer (with proper moisture content) can last 2-3x longer.

The Paper Towel Germination Test

Before committing seeds to soil (where you cannot see what is happening), test germination rate:

1. Wet a paper towel or cloth until damp but not dripping.
2. Place 10 seeds on the towel, evenly spaced.
3. Fold the towel over the seeds or place another damp towel on top.
4. Place in a ziplock bag or covered container (retains moisture).
5. Store in a warm location (20-25°C / 70-80°F). Top of a water heater, near a stove, or in a sunny window.
6. Check daily. Keep the towel moist.
7. Count germinated seeds after the expected germination time for that species (3-14 days for most vegetables).

Interpretation:

• 8-10 out of 10 sprout = excellent. Plant at normal spacing.
• 5-7 out of 10 = moderate. Plant at 1.5x density to compensate.
• 3-4 out of 10 = poor. Plant at 2-3x density.
• 0-2 out of 10 = not worth planting unless it is all you have.

Seed Storage & Saving

Optimal Storage Conditions

The rule of thumb: the sum of temperature (°F) and relative humidity (%) should be under 100. So: 50°F (10°C) and 40% humidity = 90, which is excellent. 80°F (27°C) and 50% humidity = 130, which is poor.

Best storage:

• Sealed glass jars (canning jars with lids) with a desiccant packet inside
• Stored in a root cellar, basement, or buried cache (cool, stable temperature)
• Labeled with species, variety, date harvested, and germination test results

Acceptable storage:

• Paper envelopes inside a sealed container with desiccant
• Mylar bags with oxygen absorbers (standard food storage prep)
• Ziplock bags with air squeezed out, in a cool dark location

Avoid:

• Plastic bags alone (permeable to moisture and gases)
• Any location with temperature swings (attic, garage, vehicle)
• Anywhere near moisture (bathroom, kitchen, laundry)

Saving Seeds From Your Harvest

Open-pollinated varieties: Let the healthiest, best-producing plants go to seed. Collect seeds when fully mature and dry on the plant. For wet-seeded crops (tomatoes, cucumbers, squash), scoop seeds from mature fruit, ferment in water for 2-3 days (destroys germination-inhibiting gel), rinse, and dry thoroughly.

Isolation distances: To keep varieties pure, plants of the same species must be separated. Corn: 500 meters minimum (wind-pollinated). Squash: 500 meters or hand-pollinate. Tomatoes and beans: self-pollinating, minimal isolation needed (1-3 meters).

Drying: Seeds must be thoroughly dry before storage. Spread on screens, plates, or newspaper in a warm, dry, ventilated area. Seeds are dry enough when they snap rather than bend (for large seeds) or shatter when hit with a hammer (for grain seeds).

Building a Seed Library

Organize your seeds like a library — because that is what they are: a library of genetic information that feeds your community.

Label each container with:

• Species and variety name
• Date collected
• Source (original packet, your harvest, trade)
• Open-pollinated or hybrid
• Last germination test date and result
• Any notes (disease resistance, flavor, yield)

Organize by:

• Planting season (spring, summer, fall)
• Plant family (helps with crop rotation)
• Urgency (short-lived seeds like onion should be planted first)

Replant annually: Even in storage, seeds slowly die. Plant a portion of your stock each year and save new seeds from the harvest. This keeps your seed library alive and adapts varieties to your local conditions over generations.