Rice was grown in the area as early as the Yayoi period. The name “Asao” appears in Heian period records, and as the name implies, the area was noted for its production of hemp.
Rice cultivation took place in the region as early as the Yayoi period. The name "Asao" is documented in Heian period records, and given its etymology, it suggests that hemp production was a notable aspect of the area.