Salvia Miltiorrhiza (Chinese: ??), also known as Red Sage, Chinese Sage, Tan Shen, or Danshen, is a perennial plant in the genus Salvia, highly valued for its roots in traditional Chinese medicine. Native to China and Japan, it grows at 90 to 1,200 m (300 to 3,940 ft) elevation, preferring grassy places in forests, hillsides, and along stream banks. Dan Shen is a deciduous perennial with branching stems that are 30 to 60 cm (0.98 to 1.97 ft) tall, with widely spaced leaves. Flowers grow in whorls, with light purple to lavender blue corollas that are approximately 2.5 cm (0.082 ft) long, with a dark purple calyx. Salvia Miltiorrhiza prefers well-draining soil, with about half a day of sunlight. It is hardy to approximately ?10 °C (14 °F).