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The 'Three Sisters' are the three main agricultural crops of some Native American groups in North America: squash, maize, and climbing beans (typically tepary beans or common beans).
In a technique known as companion planting, the three crops are planted close together. Flat-topped mounds of soil are built for each "cluster", about 30 cm (1 ft) high and 50 cm (20 in) wide, and several maize seeds are planted close together, in the very center of each mound. When the maize is 15 cm (6 inches) tall, beans and squash are planted around the maize, alternating between beans and squash.
The three crops benefit from each other. The maize provides a structure for the beans to climb, eliminating the need for poles. The beans provide the nitrogen to the soil that the other plants utilize and the squash spreads along the ground, monopolizing the sunlight to prevent weeds. The squash leaves act as a "living mulch," creating a microclimate to retain moisture in the soil, and the prickly hairs of the vine deter pests.
In parts of the Atlantic Northeast, fish or eel were often planted with the maize seeds, to act as additional fertilizer where the soil was poor.

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★ History of the Three Sisters: Corn, Beans and Squash