Tian Ma, Gastrodia (Gastrodia Elata) is mainly produced in provinces of Sichuan, Yunnan, and Guizhou in China. Gastrodia Elata is a parasitic perennial herb. The plant has long elliptical underground rhizome with a diameter of 3-5 centimeters but may grow up to 7 centimeters. The stem is erect, the orange yellow, tan, cylinder, and leafless. Blooming time is from June to July and fruiting time is from July to August.