Vitex or Chaste Tree is a drought hardy, deciduous, large shrub. It produces lovely lavender flowers in later summer. Historically this plant is prized for its ability to restore balance to the female hormonal system. Throughout Europe, where herbal medicine has more of an unbroken tradition than the United States, Vitex is the number one herb to help relieve symptoms of female hormonal imbalances, such as depression, cramps, mood swings, water retention, weight gain and other PMS symptoms associated with the menstrual cycle. Vitex extracts have been prescribed for uterine fibroid cysts and to help ease the symptoms of menopause. It is a hardy and drought tolerant smallwhich enjoys full sun. tree perennial to Zone 6.