Tōhoku region
Tōhoku was traditionally considered the granary of Japan because it supplied Sendai and the Tokyo-Yokohama market with rice and other farming commodities. Tōhoku provided 20 percent of the nation's rice crop. The climate, however, is harsher than in other parts of Honshū due to the stronger effect of the Siberian High, and permits only one crop a year on paddy fields.
Yomitan
Another important crop in Yomitan is the , if not for its value as a cash crop then as part of the local culture and tourist industry; the town promotes itself as the , and holds a contest each year. Sweet potato cultivation first reached Japan via Okinawa from present-day Taiwan, predating rice cultivation, and either Yomitan or neighboring Kadena can lay claim as the first cultivators of sweet potato in Japan.