Three Sisters are the three main agricultural crops of various Indigenous peoples of North America: squash, maize, and climbing beans.

Three Sisters crops have traditionally been planted in the same area, and are an important example of intercropping, the practice of growing two or more crops in proximity.

Overall, this practice produces a greater yield on a given piece of land while saving space and resources, due to the mutually beneficial relationships between the crops. The practice also reduces pests, weeds, disease, and fertilizer demand.

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Wikipedia / Three Sisters

Almanac / What Is a Three Sisters Garden?