A traditional food native to the Andes region of South America, these Oca were re-introduced by Dr. Alan Kapuler, PhD, public domain plant breeder, of Peace Seeds in Corvallis. Yellow tubers with pink eyes grow 1-6 inches long. Sprawling succulent stems. Grow similar to potatoes. Traditionally the tubers are exposed to sun and cold for several days after harvest to increase sweetness. Light exposure also enriches the vivid colors.