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Corn loves nitrogen rich soil, and beans are a wonderful companion to corn. Beans develop nitrogen nodules on their roots and are considered a green manure. As you plant your corn, you can plant 4 to 6 beans of the vining variety in a circle around each cup. The corn stalk will provide a support for the beans, and the beans will provide nitrogen for the corn. The corn stalk roots grow deeply; the bean roots are shallower so they won't compete for space.