Green manures like these peas and beans are useful for suppressing weeds and improving soil on areas that are not currently growing crops to be harvested for food.
Peas and beans are in the legume family and legumes are particularly good because they can fix nitrogen from the air into the soil via nodules in their roots.
It would great if the spiral pattern helped to focus and intensify this nitrogen fixing process. However, as yet I have no evidence that this is the case!
One can always dream. Especially when gardening.
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