the size of garden is only one aspect. the amount of labour required; the cropping capacity of the land is not inexhautible, and must be borrowed from elsewher

the size of garden is only one aspect. the amount of labour required; the cropping capacity of the land is not inexhautible, and must be borrowed from elsewhere [fertiliter] if you use the same land for succesive crops. if average human lives 70 years thats 70 crop years times acreage of 1-2acres required. either the same piece of land is farmed and reamended 70 times or location changes periodically when a piece of land becomes crop barren. certain crops such as corn will decimate the soil content, and have to be grown in rotation with soy or others