St. John's Wort Herbal Extract Tincture, Super-Concentrated Organic Saint John's Wort (Hypericum Perforatum) Dried Herb and Flower St. John's Wort is a flowering shrub that belongs to the Hypericaceae family, the genus Hypericum. It is a perennial herb, growing up to 90 cm in height (20-90 cm) in dry, sunny places. The stem is reddish, with opposite, oval leaves in pairs. It was considered a "magic herb" used to ward off evil spirits in the past but later, its medicinal properties were discovered and recognized worldwide.