Three Sisters Agriculture

The Three Sisters — corn, beans, and squash grown together in a single mound — is the foundational agricultural system of Indigenous North America, practiced by the Haudenosaunee (Iroquois), Cherokee, Pueblo, and dozens of other nations for thousands of years before European contact. The Three Sisters is not just a planting technique; it is a nutritional system (corn provides carbohydrate, beans provide protein and nitrogen fixation for the soil, squash provides vitamins and its broad leaves shade the ground to retain moisture) and a cultural philosophy (the three plants are understood as inseparable sisters who care for each other). The system predates European arrival by at least 3,000 years and represents one of humanity's great agricultural innovations — a polyculture that produces more nutrition per acre than any single-crop system.

The planting technique: a mound of earth (30-40cm high, 50-60cm diameter) with corn seeds planted at the centre. When the corn reaches 15cm, bean seeds are planted around the corn stalks (the beans climb the corn as a living trellis). Squash seeds are planted around the perimeter (the squash vines spread outward, their broad leaves shading the soil). The three plants grow together: the corn provides structure for the beans; the beans fix atmospheric nitrogen into the soil, fertilising the corn and squash; the squash leaves suppress weeds and retain soil moisture. The system is self-sustaining and requires no external inputs — no fertiliser, no irrigation (in most climates), no pesticide.

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