Why were some crops grown by medieval Japanese farmers?

Medieval Japanese farmers primarily grew rice, which was central to their diet and culture, serving as a staple food and a form of currency. Other crops included barley, millet, and various vegetables, which contributed to dietary diversity and resilience against crop failures. The cultivation practices were heavily influenced by the seasonal climate and the need for community cooperation in irrigation and farming efforts. Additionally, certain crops were chosen for their ability to thrive in the diverse regional climates of Japan.