Armstrong Research and Demonstration Farm
For centuries, companion planting has been practiced by many tribal groups throughout the world. Three Sisters is one example of companion planting known to Native American tribes. Corn, beans, and squash are grown together, providing high yielding, high-quality crops with a minimal environmental impact. Companion planting has taken a growing interest among today’s conventional farmers.
Iowa State University
Riesselman, Leah B., "Companion Planting: A Method for Sustainable Pest Control" (2010). Iowa State Research Farm Progress Reports. 295.