Bai Mao Gen is called Woolly Grass Rhizome or Japanese Blood Grass in English. This herb is sweet and cold in nature, and is used to clear heat and help to halt bleeding. Bai Mao Gen has a scaly rhizome and can grow up to 60cm in length. It's light and tough in texture, pale yellow/white in colour. It's This herb is collected during the Spring and Autumn, washed and then dried in the sun.