re: Society breaks down and you have to make it in a subsistence agriculture situation

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Man you better have a green thumb to live off that acreage.

In the old days if someone tried to live off that plot of land they would also be bartering their services to others in exchange for additional food to supplement. IE trade your carpentry work for eggs if you didn’t keep chickens.

If you want to live as an island with 1 acre that would be very difficult.

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I produced over 100 lbs of vegetables on about 250 sq ft last year. Unless you are throwing beef/pork into your agricultural operation, you could do alright on an acre. I have 2 blueberry bushes, 6 strawberry plants, 2 blackberries, and 2 garden plots on MAYBE 500 sq ft. Am I going to live off of that? Not entirely. But it's a pretty good start. Add meat from hunting and fishing, and some fruit/greens/mushrooms from foraging, and I can provide a good chunk of the food for my family of 4.

ETA: Now, more acres is definitely better to produce your own meat, but not necessary if you can hunt and fish.