Depending on what you want to plant, you should keep in mind that most plants produce CO2 at night and this in itself is toxic to humans.

Probably this is the reason behind people getting dizzy or tired more easily at night while watering the garden.

Anyways, I recommend that there is a space of 10 meters between the crops and your bed so as not to die from CO2 poisoning.

Now if you mean the total size required on a piece of land you could have around 150 square meters, that I think would be more than enough, 4 square meters to put your bed, 2 square meters to put your bathroom or hole in the floor, and well you would have to have a big wall around so that they don't come to steal your things, so I assume that they will be stone walls 2 meters thick that cover the entire perimeter of the property in question.

And well..I think that could be more than enough if you want to plant to survive, especially if you want to plant potatoes because it occupy mostly underground space and not shallow so you would have space to make about 5 crops of 7 meters long by 2 wide all over the place.
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