Popular tonic, one of the 50 fundamental herbs in China. Perennial member of pea family related to licorice. Root extract is sweet and is being trialed as an immune enhancer for cancer sufferers. Used to help the body resist colds and increase stamina. Likes a well drained, slightly alkaline soil in sunny position. Seeds will take 4 to 9 weeks to germinate. Sow in Spring or shade-house over the first winter. Mature plants are very cold tolerant.