The american indians had a 3 crop system
They would plant corn, beans and squash in the same ground The corn would go in first, the beans would then grow up the corn with the squash growing on the ground below / between them.
Its just a high efficiency/max production system for a given space.
I tried "three sisters" this year = it doesn't like 80mph winds
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Elen makes a good point on the JA - but I have found that if you want to eliminate them, they are easy to identify....when the new ones pop up, just hoik them up like weeds. Keep that up till early summer and they are all gone.
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Red