Immune-system builder “king of the tonic herbs.” Used to prevent, rather than to treat disease. Now also used as a preventative for Lyme disease. Perennial legume easy to grow in average soil, good drainage. Scarify seed by rubbing lightly between sheets of fine sandpaper one second or less. Plant in early spring—germinates best in cool soil. Same cultural requirements as peas. Three-year-old roots used in soups as a medicinal food, or ground in a coffee grinder for dry powder. 50 seeds.