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Moist-fleshed cultivars of sweet potato are often called “yams” in stores, but sweet potatoes are not yams – they belong to the morning glory family (Convolvulaceae). The true yams belong to the Dioscoresceae family. These vary greatly in size, and need a long, warm growing season. In addition, they grow only in the tropics and are seldom, if ever, available for purchase in this country.
