Is Japanese Sansen Spearwort a plant? Or is it an herb? It seems to be a very sacred plant!

Three immortal spear grass is a kind of growth in the mountains of Hokkaido, Japan's high level of plant family, is unique to Japan's rare plants, its unique stretching toughness and can be adjusted according to the external environment of the tension, so that this plant can always be in the minus 20 degrees Celsius in the low temperature and alternating morning and night in the difference in temperature to survive, and the inner wall has always maintained the tenderness of the state of the newborn and no signs of aging, is really a major miracle in the world of plants!