The Three Sisters
...d to cultivate heat tolerant vegetables and upped the ante by planting the Native American three sisters–corn, beans and squash. The three sisters are textbook permaculture, the idea being that the beans nitrogenate the soil and climb up the corn while the squash provides mulch. All plants are useful and you end up with an interdependent, self-sustaining beneficial feedback loop. Some people add a fourth sister, Rocky Mountain bee plant (Cleome se...