Frost flower is blooming from stems of Keiskea japonia, Japanese name Shimo-bashira, 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 from stems in cold early morning.
Frost flower can be seen only early morning in cold winter. I found them in Shakujii park. These flowers were vanished just after sun rise.
he 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.