Scientific Name: Hypericum perforatum L. ( ITIS) Common Name: St. Johnswort, St. John's wort, common St. Johnswort, Klamath weed, common goatweed, tipton weed. It has been used for centuries for its pharmacologic properties in fighting depression, insomnia and anxiety, and for promoting weight loss. It’s traditionally harvested around St. John’s Day in … Basic Description. In the genus Hypericum are the shrubby St. John’s-Worts. The bright yellow flowers with a profusion of yellow stamens look like fireworks. Overview Information St. John's wort is a plant with yellow, star-shaped flowers and five petals that grows in Europe, North and South America, Australia, New Zealand, and Eastern Asia. Common St. John's-wort can be quite invasive, forming dense colonies and crowding out native plants. A dense little shrub with stiff erect stems and forest green leaves. The Garden wouldn't be the Garden without our Members, Donors and Volunteers. The common name stems from the fact that various European species flower around June 24, which is the feast day of St. John the Baptist; “wort” derives from an Old English word for herb or plant. A compact, deciduous, rounded shrub with an erect habit that typically grows 1-4' (less frequently to 5') tall. Great St. John's Wort ~ Hypericum ascyron (pyramidatum) Great St. John's Wort is the showiest Hypericum species in the midwest.The large bright yellow, 5 parted flowers are over 2" in width. Roundpod St. John's-wort, also spelled St. Johnswort, is a Florida native found throughout the state, and a farily common one at that. The plant spreads rapidly by means of runners or from the prodigious seed production and can invade pastures, disturbed sites, dirt roads, the sides of roads and highways, and sparse woods. While the general shape of this flower resembles other St. John's-wort species, the size of the flower sets Great St. John's-wort apart from the rest. St. John’s wort, sometimes known as St. Joan’s wort, (Hypericum perforatum) is one sign that summer has indeed arrived. Tolerates wide range of soils, including dry rocky or sandy soils. Easily grown in average, medium, well-drained soil in full sun to part shade. The erect stems are unbranched, except in the upper-third of each plant. According to Flora of North America, there are at least 3 subspecies of Hypericum ascyron, but apparently only subsp. Appropriately dubbed by many as a magical plant, St. John’s Wort (hypericum perforatum) carries a rich history, full of cultural nuances and mystical legends.Dr. Blooms on new growth. The plant spreads asexually by creeping rhizomes and readily reseeds itself with seeds that can persist for years in the soil seed bank. St. John’s wort is a powerful herbal compound that’s been used to treat depression with the same efficacy and fewer side effects than traditional antidepressants. St. John's wort (Hypericum perforatum) is a flowering shrub native to Europe. Root rot and wilt can be significant problems in hot and humid climates. A compact, deciduous, rounded shrub with an erect habit that typically grows 1-4' (less frequently to 5') tall. Stamens are bushy to the point of partially obscuring the petals (hence the species name of prolificum which refe… St. John's wort is a perennial plant native to Europe but found throughout the United States and parts of Canada. The popular herbal therapy is often used to … Ring in the new year with a Britannica Membership - Now 30% off. One of the most well-known species is the common, or perforated, Saint-John’s-wort (H. perforatum), which is native to Europe, northern Africa, and western Asia. Each stem is light green, glabrous, 4-angled, and slightly winged on the angles. In the western United States, where it is commonly known as Klamath weed, certain beetle species (Chrysolina quadrigemina, C. hyperici, and Agrilus hyperici) have been introduced in many locations to eat the plants and keep them under control. It can be found growing on roadsides, sparse bushes, embankments and even on rubbish dumps. A native of partly shaded, moist sites in woodlands, woodland edges as well as along riparian areas. It is an aggressive weed that grows in the dry ground of roadsides, meadows, woods, and hedges. It gets its name from the fact that it often blooms on the birthday of the biblical John the Baptist.The flowers and leaves of St. John's wort contain active ingredients such as hyperforin. The flowers are used to make liquid extracts, pills, and teas. The seeds can persist for decades in the soil seed bank, germinating following disturbance. Creeping Saint-John’s-wort bears pale yellow flowers with orange stamens on 30-cm- (1-foot-) tall plants, while goldencup Saint-John’s-wort has slightly smaller deep yellow flowers with darker stamens. Creeping Saint-John’s-wort (H. calycinum), sometimes known as rose of Sharon or Aaron’s-beard, and goldencup Saint-John’s-wort (H. patulum) are both shrubby East Asian species. Creeping Saint-John’s-wort (H. calycinum), sometimes known as rose of Sharon or Aaron’s-beard, and goldencup Saint-John’s-wort (H. patulum) are both shrubby East Asian species. Depending on environmental and climatic conditions, and rosette age, St John's wort will alter growth form and habit to promote survival. Visitors to our yard often ask if it's a shrub because of … St. John’s wort, botanically known as Hypericum perforatum, is a wild plant native to Europe and Asia. Bark of older stems exfoliates to reveal attractive, pale orange inner bark. Our editors will review what you’ve submitted and determine whether to revise the article. A landscape workhorse, St. John’s wort is a champion at providing food and shelter to wildlife—especially pollinators—as well as adding blossoms, colorful foliage, and great texture to entry gardens, foundation plantings, perennial beds, and mixed shrub borders. Also, the herbal supplement St. John’s wort can alter the metabolism of drugs such as protease inhibitors, anticlotting drugs, and antidepressants, and it can reduce the effectiveness of oral contraceptives.…, Several herbs, especially St.-John’s-wort and yarrow, are potent against fairies, and hawthorn trees, foxglove, and groundsel are so dear to them that abuse of these plants may bring retribution.…. Hypericum prolificum, commonly called shrubby St. John's wort, is a Missouri native plant that occurs on rocky ground, dry wooded slopes, uncultivated fields, gravel bars along streams and in low, moist valleys. 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