A subsistence system succeeds or fails on the width of its supply window, not on the height of its peak. A garden that yields heavily in September and nothing in May has moved the gap, not closed it.
Why a yield plan fails
Most food plans are built around yield. Yield is one figure per crop per year, so the plan acquires one harvest date per crop, and the household eats well for six weeks and badly for twenty. Availability is a distribution problem, and distribution problems are solved by looking at the whole year instead of the best week in it.
The three layers
Seasonality applies to all three layers, not only to vegetables. A plan that charts fresh produce alone looks adequate in July and starves in March.
1 · Fresh. Garden, perennials, orchard, field. Wide but thin, and absent for part of the year in any climate with a real winter.
2 · Store. Root cellar, grain and preserved goods. This layer exists in order to cover the gap, so it is eaten mostly in late winter rather than admired in autumn.
3 · Animal. Eggs, milk, meat and fish. Each has its own season. This is the layer most calendars leave out, and the one that fails hardest in December.
The availability matrix
Read down a column to see what a single month actually offers. Read across a row to see how long one layer lasts. The months where every row is weak are the ones the design has to answer for.
| Layer | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fresh garden | · | · | · | ○ | ○ | ● | ● | ● | ● | ○ | ○ | ○ |
| Perennials | · | · | ○ | ● | ● | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
| Fruit & nuts | · | · | · | · | ○ | ● | ● | ● | ● | ● | ○ | · |
| Field staples | · | · | · | · | · | · | ● | ● | ● | ○ | · | · |
| Store | ● | ● | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ● | ● | ● |
| Preserved | ● | ● | ● | ● | ○ | ○ | ○ | ○ | ○ | ○ | ● | ● |
| Animal | ○ | ○ | ○ | ○ | ● | ● | ● | ● | ● | ○ | ○ | ○ |
| Wild / foraged | ○ | ○ | ○ | ● | ● | ● | ● | ● | ● | ● | ● | ○ |
| Protected | ○ | ○ | ○ | ● | ● | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
The gap, named
In a temperate climate the failure arrives in one place, and it lands on three layers at once. From December to March the three layers fail together: the fresh layer is close to empty, the store is being drawn down hardest, and the animal layer falls in the same weeks because laying follows daylight and lactation follows grass. Four months in which everything that could contribute contributes least, arriving in the part of the year when a household eats most.
Finding your own gap
The matrix above is a shape to copy, not a set of facts about your ground. Build your own version in four steps.
- List what you actually produce, in your own categories. Do not use someone else's rows if they do not match what you grow and keep.
- Mark each month honestly. Peak, available, thin, or none. Record what you ate, not what you planted or hoped for. A planting that failed is a none.
- Read down the columns and find the consecutive months where every layer is thin or none. That span is your gap, and its length matters more than its depth.
- Write down what currently fills it. If the answer is a shop, write that down. That is the thing the design is for.
Then re-score it once a year against what you actually ate. The first version is a guess and the third version is a record.
Twelve design responses
Each of these attacks the gap directly rather than raising the peak.
- Sow in succession, not in one block. Stagger salad, radish, beet, carrot, beans and brassicas at two to four week intervals so that no single harvest date arrives and leaves again.
- Plant perennial vegetables. Asparagus, rhubarb, sorrel, sea kale, walking onions, perennial brassicas, daylily, hosta, ostrich fern, lovage. They produce in the weeks when nothing else can, which is exactly where a gap opens.
- Grow overwintering crops. Mâche, claytonia, spinach, kale, leeks, parsnips and Jerusalem artichokes are the difference between a thin month and a hungry one.
- Size the store to the gap, not to the harvest. A root cellar, grain, and the late-summer preserves are the load-bearing layer for the cold months. A store built to admire a good August does not feed a February.
- Choose storage crops over peak-yield crops. Winter squash, storage onions, keeping cabbage, storage apples, potatoes, dry beans and the hulled wheats keep. A crop that only eats well in its own week is not food security.
- Take the sugar when it comes. In a cold climate maple is the only new harvest in the dead of winter, and it arrives when the store is thinnest.
- Time livestock to the calendar. Laying follows daylight, lactation follows grass, and slaughter follows condition. Manage all three deliberately or the animal layer collapses in the same weeks the fresh layer does.
- Extend both shoulders with protection. Cold frames, row cover and a high tunnel move the spring and autumn boundaries, which are the two edges of the gap.
- Treat the wild layer as designed, not merely taken. Foraged greens, mushrooms, nuts, berries and fish carry the months a garden cannot, and they are the cheapest thing on this page to increase.
- Use water as ground. Ponds, wet margins and watercress beds produce through the cold months without a structure or an energy input.
- Match perennial planting to the ground you actually have. Acid ground that will not grow brassicas will grow blueberry, cane fruit, elderberry, chestnut, hickory and oak. Those are the store and mast layers that a winter needs. Match the plant to the soil instead of amending the soil to the plant.
- Check the store against need, in calories. A calendar shows how food is distributed through the year. Accounting shows whether there is enough of it. Those are two separate jobs, and a wider window does not raise the total.
What appropriate technology changes, and what it does not
- Preservation capacity. Dehydrators, pressure canners, reliable fermentation and vacuum sealing turn a late-summer glut into winter food at a scale no pre-industrial kitchen could reach.
- Protected growing. A passive-solar greenhouse, thermal mass and row cover extend the frost-free window at both ends, which is where the gap sits.
- Cold storage with minimal energy. An earth-sheltered root cellar with designed ventilation does what a ventilated hanging safe did, at the scale of four months of food rather than four weeks.
- Light for the flock in the short days. A small photovoltaic circuit running supplementary lighting in a hen house answers the winter egg collapse directly. It is the clearest case of a gap that the older system could not close.
- What none of it changes. There is no way to grow a tomato in January without paying for it in energy. A plan that claims otherwise has moved the cost off the land and onto a bill.
What this page is, and what it is not
- The shape is general, the dates are not. The matrix is an example for a temperate climate with four real seasons. Your own windows will differ by weeks, and the further you are from that climate the more they differ. The method is the durable part.
- The month rows are ordinary horticultural practice. They are a starting shape drawn from standard growing calendars, not measurements taken on your ground. Replace them with your own recorded dates as you accumulate them.
- Nothing here accounts for calories. A well-stocked cellar and a nearly empty one photograph the same way. Whether the food is sufficient for the people eating it is a separate calculation, and this page does not make it.
- A wider window does not add food. Spread too little across twelve months and the shortage is simply distributed more evenly. Widening the window is worth doing and it is a different job from growing more.
Where this fits among the other guides
This page covers the shape of the year: what is available when. The month-by-month pages cover the work, and the preservation guides cover the layer that carries the cold months.