Frost flower is blooming from stems of Keiskea japonia, which belongs to sage family. Keiskea japonia blooms cluster of white flowers in autumn, turn into winter, live roots supply to stems and thin layers of ice are extruded fromstems in cold early morning.

The plant is loved by Showa Emperor, who was also a botanist.

This flower is an endemic species of Japan and named by famous Japanese botanist Prof. Keisuke Ito.