Nutritionally, when eaten together, corn, beans and squash provide all of the essential amino acids needed to make a complete protein. Corn provides the carbohydrates and complementary amino acids to the beans, dried beans are rich in protein and the squash provides additional vitamins and healthy oils from the seeds.
In Native American culture, the story of The Three Sisters explains the interconnectivity of squash, beans and corn. The symbiotic relationship is both physical and spiritual.
When grown together beans, corn, and squash work together to create the best possible environment to thrive. It is said that the beans impart nitrogen for the corn to grown, the corn stalks offer climbing bean vines a trellis to ascend, while squash leaves provide shade, keeping the soil hydrated and preventing weeds.
From the Carnegie Museum of Natural History, “To the Iroquois people, corn, beans, and squash are the Three Sisters, the physical and spiritual sustainers of life. These life-supporting plants were given to the people when all three miraculously sprouted from the body of Sky Woman’s daughter, granting the gift of agriculture to the Iroquois nations.”