Blue vervain is a natural tranquilizer and is helpful in all nervous conditions and can be a sleep aid. It can also act as a decongestant during colds and a cup of warm tea taken throughout the cold is very beneficial. It also is a vermifuge espicially for intestinal worms. The tea is made from the root stock and plant at the rate of 2 tsp. herb to 2 cups of water. If using dried root, simmer on the stove for 5 minutes. If using dried leaf and stem, steep for 5 minutes. If you would like to grow this plant, see if your local nursery will carry it. If not, there are several sources for the plant on-line.