Full nutritional self-sufficiency for two people.
Built from the math up.
Before you plant a single seed, you need a target. Most garden guides skip this step entirely. This one starts here.
Two adults require approximately 2,000 calories per day each — 4,000 calories combined. Over a full year, that's 1,460,000 calories. That's your production target. Everything downstream — which crops, how much space, how long to grow — flows from that number.
Beyond calories, a self-sufficient diet needs adequate macronutrients. The table below shows the annual target for two adults and which crop categories cover each requirement.
| Nutrient | Daily Target (2 adults) | Annual Total | Primary Crop Sources |
|---|---|---|---|
| Calories | 4,000 kcal | 1,460,000 kcal | Potatoes, beans, sweet corn, squash |
| Protein | 110–130 g | 40–47 kg | Dried beans, peas, corn + bean combos |
| Carbohydrates | 500–600 g | 182–219 kg | Potatoes, sweet potatoes, winter squash, corn |
| Fats | 70–90 g | 25–33 kg | Sunflower seeds, pumpkin seeds (limited from garden alone) |
| Vitamin C | 170 mg | — | Peppers, tomatoes, kale, potatoes |
| Iron | 18 mg | — | Dried beans, lentils, leafy greens, pumpkin seeds |
| Calcium | 2,000 mg | — | Kale, bok choy, dried beans — supplement or fermented dairy recommended |
Not all crops earn their space. This matrix ranks common vegetables by the three metrics that matter for self-sufficiency: calories per square foot, ease of growing, and storage life.
Caloric yield per square foot is the primary filter. A crop that's delicious but low-yield and won't store is a luxury, not a staple. Build your base with the top-ranked crops first, then layer in variety once the foundation is solid.
| Crop | Cal / ft² / yr | Ease (1–5) | Storage Life | Protein | Priority |
|---|---|---|---|---|---|
| Potatoes | ≈ 77 | 4 / 5 | 4–8 months (root cellar) | Low | ★ Core |
| Sweet Potatoes | ≈ 70 | 3 / 5 | 6–12 months (cured) | Low | ★ Core |
| Dry Beans (navy, black) | ≈ 60 | 4 / 5 | 1–5 years (dried) | High | ★ Core |
| Field Corn (dent) | ≈ 40 | 3 / 5 | 1–3 years (dried) | Moderate | ▲ High |
| Winter Squash (butternut) | ≈ 35 | 4 / 5 | 3–6 months (cured) | Low | ▲ High |
| Peas (dried) | ≈ 30 | 4 / 5 | 1–3 years (dried) | High | ▲ High |
| Turnips / Parsnips | ≈ 22 | 5 / 5 | 3–5 months (root cellar) | Low | ◆ Filler |
| Beets | ≈ 18 | 5 / 5 | 3–5 months / pickled 1 yr | Low | ◆ Filler |
| Carrots | ≈ 15 | 3 / 5 | 4–6 months (root cellar) | Low | ◆ Filler |
| Kale / Collards | ≈ 8 | 5 / 5 | Frozen 6 mo / fermented 6 mo | Low-Mod | Micronutrients |
| Tomatoes | ≈ 7 | 3 / 5 | Canned 1–2 years | Low | Vitamins / morale |
| Zucchini | ≈ 5 | 5 / 5 | 2–3 months fresh only | Low | Low priority |
The math-driven crop list looks nothing like a traditional kitchen garden. Potatoes, sweet potatoes, dry beans, and corn — boring staples — are what actually keep two people fed through winter. Everything else builds nutritional completeness around that core.
A full-year growing calendar. Continuous production means no gap months — you're always starting, growing, or harvesting something. This schedule is built for USDA zones 5–7 (adjust 2–3 weeks earlier for zones 8+, later for zones 3–4).
Key principle: harvest a bed, amend it, replant it the same week. Early peas come out in June — bush beans go in. Garlic comes out in July — fall brassicas go in. Dead time is wasted space.
The 400 ft² minimum plot is organized into functional zones — not by aesthetics but by how crops interact with each other and how you work the space. Every bed has a job.
The base layout uses a 20 × 20 ft footprint (400 ft²) as the minimum, with an optional extension to 600 ft² for more buffer and variety. Beds are 4 ft wide — arms reach from both sides without stepping in. Paths are 18–24 in. The perimeter is where squash sprawls.
Total planned footprint: ~408 ft² (beds only). Add 30–40% for pathways and that's a 20 × 25 ft area — about the size of a single-car parking space. If you have more room, replicate Bed A (potatoes) first. Second year buffer goes into storage security, not variety.
The goal is a closed-loop fertility system. By year 3, you shouldn't need to buy amendments. Everything the garden produces goes back in — food scraps, crop residue, humanure if you're willing, animal manure if you have it.
Year 1 is the exception. You're building from scratch, and you need to invest to get soil biology going. Year 1 inputs pay dividends for years 2–5 if you close the loop.
| Input | Amount | Purpose | When |
|---|---|---|---|
| Aged compost | 2–3 cubic yards | Organic matter, microbial starter, structure | Fall before planting or early spring |
| Wood ash | 2–4 lbs | Potassium, pH adjustment (if acidic) | Spring, worked in 2 weeks before planting |
| Bone meal | 3–5 lbs | Phosphorus for root crops and legumes | At planting, worked into root zone |
| Blood meal | 2–3 lbs | Nitrogen for heavy feeders (corn, squash) | Sidedress when plants are knee-high |
| Lime (dolomitic) | 5–10 lbs | pH correction (only if below 6.0) | Fall — takes months to neutralize |
Two adults produce approximately 1,000–1,200 lbs of food scraps per year plus toilet waste (if composted). The garden produces significant crop residue — bean vines, corn stalks, potato tops, squash vines. All of it composts.
A working compost system for a garden this size needs two bins: one cooking while one is being filled. Minimum bin size: 3 × 3 × 3 ft each. Optimal carbon:nitrogen ratio is 25–30:1. In practice: roughly 3 parts dry material (straw, cardboard, dry leaves) to 1 part wet green material.
A garden that produces but can't preserve is only a summer garden. Year-round self-sufficiency requires matching every crop to the right storage method before harvest. This is the logistics layer most guides skip.
The goal: by October 31, you have enough preserved food to carry two people through April with no fresh production. That's a 6-month bridge. Everything you put up in fall is deliberately planned against that target.
| Crop | Method | Conditions | Duration | Notes |
|---|---|---|---|---|
| Potatoes | Root cellar / cool basement | 34–40°F, 90–95% humidity, dark | 4–8 months | Cure 1 week at 50°F first. No light or they green. |
| Sweet Potatoes | Cured then cool storage | 55–60°F, 85% humidity | 6–12 months | Cure 10–14 days at 80°F immediately after harvest. Don't refrigerate. |
| Dry Beans | Dried, sealed containers | Cool, dry, airtight | 2–5 years | Moisture is the enemy. Add a desiccant pack. Test: beans should shatter, not bend. |
| Field Corn (dent) | Dried on cob, then shelled | Below 12% moisture, cool/dry | 2–3 years | Dry on cob until kernels dent and pull free. Mill as needed. |
| Winter Squash | Cured, room storage | 50–55°F, 50–70% humidity | 3–6 months | Cure 2 weeks at 80°F. Check weekly — one rotting squash ruins neighbors. |
| Tomatoes | Water-bath canning | Sealed jars, cool dry shelf | 12–18 months | Crushed tomatoes or paste pack the most volume per jar. Add lemon juice for pH safety. |
| Carrots / Beets | Root cellar or sand storage | 32–40°F, high humidity | 4–6 months | Layer in damp sand in wooden crates. Remove tops first. |
| Kale / Greens | Blanch + freeze | Freezer | 10–12 months | Blanch 2–3 min, ice bath, squeeze dry, bag. Or lacto-ferment in brine. |
| Garlic / Onions | Cured, braided / mesh bags | 60–70°F, low humidity, airflow | 6–9 months | Cure until papery skins. Store away from potatoes (moisture exchange). |
This is the checklist you run against in October. If any line is short, you address it with stored purchased equivalents — not garden failure, just planning math.
Get the printable version of the guide — including the full crop matrix spreadsheet, bed layout templates, and the fall inventory checklist.
Read the Free Guide →