Growing multiple food crops together is a more sustainable farming practice mimicking highly productive wild plant communities. This process, known as intercropping, takes advantage of complementary features of different types of crops to maximize production and minimize the need for fertilizers and other environmentally harmful practices. For example, indigenous people in North America have long grown corn, beans and squash together to maximize the yield of each plant and reduce the need for watering or fertilizer.
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Source: Phys.org