The north slope of Mount Izumi Katsuragi is covered in a wood of Japanese beech, which favor growing at elevations high enough to remain fairly cool. Harvesting the trees in this wood is forbidden by the association of Hachidairyūō shrines and temples, and this is the southernmost stand of Japanese beech on Honshū. The trees in the area were designated a national protected species in 1923, allowing them to continue to thrive in an area very close to suburban and urban growth.