I've never tried the 3 sisters, mainly because i don't like sweetcorn. However i did spend some time looking at the history of native American farming, they would plant 2-3 corn plants at the top of a small mound then place the beans and squash around the bottom. This approch makes the harvesting easier because you can walk inbetween the mounds.
The problem is this that, while this reduces the need to feed and weed around the crop, it takes up more space than planing them in seperate fields. This wasn't a problem for your average native american, especially seeing as they had no concept of property but is likely to be an issue in a modern garden.
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