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Q&A

How much land would one family need for sustainable food production?

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Help me settle an argument.

How big a patch of temperate wilderness terrain would you need to produce enough food to feed a family of four (two adults, two teens) indefinitely in an off the grid or SHTF scenario?

Assume:

  • Temperate climate similar to central-north California or the Carolinas.
  • Agrarian diet, lots of grains/veggies, meat 2-3 times/week.
  • Ground is red clay based but fairly loose / uncompacted.
  • Basic farming skills and equipment but no automation/mechanization (ie, no tractors, mules, etc. Human labor only.).
  • Access to electricity NOT guaranteed.
  • Ability to research modern methods and techniques.
  • Plentiful nearby sources of water (but no fish).
  • Frequent rainfall and mild winters.
  • Other humans aren't a threat.
  • Around 100 person-hours of work per week

Assuming you dodged all the other dangers that would be present during such an event, what are the baseline space requirements to be able to grow enough to eat enough, with enough margin for error, to stay healthy? Oh, and we want meat. And pudding. Lots and lots of pudding.

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Depending on a couple factors such as ingenuity and whether or not you are considering the land needed to hunt game to be included in the total land area needed, i think it could easily be done on two acres or less. There are many stories of people growing enormous amounts of food on small suburban plots of land.

Here are three examples of extreme productivity on very little land:

  • Growing Power – On a 2-acre urban lot in Milwaukee, Will Allen grows over a million pounds of food every year, including thousands of fish, and a livestock inventory of chickens, goats, and bees.
  • The Urban Homestead – A family of four produces most of their own food and $60,000 a year on just a fifth of an acre.
  • Singing Frogs Farm – Just 3 harvested acres on this farm bring in over $100,000 an acre, using low water methods that sequester carbon and generate topsoil. Using techniques and principles in the resources below, you can potentially grow all your food on as little as a quarter of an acre!

Source

One of the biggest concerns with growing a lot of food is the necessary water to do, so but in your question you have specified it would be plentiful.

The following info-graphic also shows that two acres would be plenty for both produce, meat and dairy.

enter image description here

Image Source

Andrew Mateskon, from Polycultures also writes:

The earth feeds 7 billion people on 3.8 billion acres of arable and permanent cropland. You can more than triple this figure if you include rangeland for meat. This is about 0.5 acres of cropland per person, or over 1.5 acres per person if we include rangeland. Some systems are vastly more efficient than others. If there were no "externalized" inputs, industrial monocropping would be the most efficient system ever seen. However, some other systems are able to feed many people with much smaller negative impact. Traditional and contemporary Chinese Agroforestry provides some of the best techniques. China imports an incredibly small amount of food, yet feeds their people to the tune of around 20 per acre. They grow carp in the ditches under fruit and nut trees with crops and herbs between trees and chickens running around. An ancient polyculture of carp, rice, and ducks is practiced in some areas. This increases the yield of the rice, plus adds two more yields to the equation, plus reduces inputs of fertilizer and pesticide.

With this example i would say it is more than reasonably to think that you could grow enough food for a family of 4 to survive on roughly 2 acres if the land was used wisely.

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