No, not a Dr Sketchy's gimmick. The Navajo Three Sisters are corn, squash and beans. These ones are from Kelly's Edible Garden Project sharing garden. Besides making a complete protein, the three grow together in mutual harmony. The corn stalks provide a pole for the beans to climb, the squash covers everyone's feet to keep them moist, and the beans fix nitrogen to feed the other two. They also make a nice palette of colours for an early autumn drawing.