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Four important tuber crops were developed in the Andes: potato, ulluco, mashua, and oca (Oxalis tuberosa). Oca is arguably the next most adaptable to temperate climates after the potato. Tubers are small, mostly 2-4 inches in length, but amazingly colorful. Cooked, they are somewhat similar to potato, but softer and often with a more acidic flavor. Yields are best in climates that remain frost free until mid-November.