By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Several species are cultivated for their attractive flowers, and at least one, common Saint-John’s-wort (Hypericum perforatum), is important in herbalism. It grows wild in fields and meadows but has also been cultivated as a garden plant. Learn more about our favorite books to help you identify and harvest plants in our post, 5 Foraging Guide Books To Help You Identify & Harvest Plants. St. John's Wort . Click below on a thumbnail map or name for species profiles. The more tame North American St. John's wort (Hypericum frondosum), which grows in USDA zones 5 through 8, is better behaved in the … Omissions? At your local nursery you will most likely find a broad leaved variety of Hypericum labeled St. John's Wort. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. St. John’s Wort is a handsome dense, rounded shrub with charming blue-green foliage. Hypericum androsaemum 'Albury Purple'. St. John’s wort is an herbaceous perennial growing in many areas around the world and has a long history of herbal use. St. John’s wort is an undemanding shrub that grows in U.S. Department of Agriculture plant hardiness zones 5 through 9. St. John’s wort is toxic and should not be cultivated. For a smaller shrub that only gets to about 3 feet tall, and two feet wide the St John’s wort has big color that can fit anywhere. In the other species these markings are absent or confined to near the petal margins. The plant isnt particular about the soil type. Our editors will review what you’ve submitted and determine whether to revise the article. Hypericum perforatum is the Latin name for the type of St. John’s Wort that’s best to grow for medicinal purposes. Saint-John’s-wort, (genus Hypericum), genus of nearly 500 species of herbs or low shrubs in the family Hypericaceae that are native to temperate and tropical areas. St. John's Wort is a perfect example of why common names need to be verified with a botanic name. Features 5-petaled, bright yellow flowers (to 1\" diameter) with numerous, yellow stamens. Submerged portions of all aquatic plants provide habitats for many micro and macro invertebrates. By making teas from the plant's dried flowers or capsules from the extracted essential oils, St. John's Wort is a valuable medicinal herb.Easy to maintain, common St. John's Wort plants practically grow themselves. What is not as commonly known is just how beautiful this plant's flowers are! Updates? The flowers are bright yellow and look almost tropical. Genus Hypericum can be annuals, perennials, shrubs or trees, evergreen or deciduous, with usually paired leaves and showy yellow flowers with prominent stamens, followed by capsules, occasionally berry-like Details H. perforatum is an upright perennial with small, ovate leaves and terminal clusters of star-shaped yellow flowers 1.5cm across It grows to 2-3 feet, with small, oval, veiny leaves, and bright yellow flowers. St. Johns wort adapts to both moist and dry soil, and even tolerates occasional flooding. Interesting Saint John’s wort varieties Hypericum andosaemum – This is the ideal specimen to set up low-lying evergreen hedges. Subordinate Taxa. Shrubby St. John's wort Shrubby St. John's wort is a low to medium-sized native shrub reaching 3 to 4 feet high. It can often be found near meadow drainages, creeks, and foothills. 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. Additional information on common St. Johnswort. More than 400 plants share the name St. John's wort (Hypericum spp.). 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. The Plants Database includes the following 78 species of Hypericum . Hypericum L. – St. Johnswort. St. James' Wort - Senecio jacobaea or Senecio aureus, two species of ragwort. Plants of the genus Hypericum (some species have been used since ancient times in the treatment of wounds) were apparently gathered and burned to ward off evil spirits on the eve of St. John's Day, thus giving rise to the genus common name of St. John's wort. St. John’s wort can be found in wooded areas. St. John's Wort - Can refer to any species of Hypericum. You may also want to consider creeping St. John's Wort (Hypericum calycinum) which does not have medicinal properties but is good for landscaping.If you plan to use this herb medically, be aware that there may be some side effects such as increased sensitivity to UV rays, sexual dysfunction, dizziness and headaches. The more than 400 species of Hypericum are annuals, perennials, shrubs, and trees that are found world-wide in a myriad of habitats. … Try planting in sandy soils such as a beach front garden, or on river embankments as its root system is heralded as a great solution to erosion. Members of the genus have simple opposite or whorled leaves that are gland-dotted and are usually smooth-margined. creeping St. … Shop 6-pack in creeping st. johnswort (l6967) in the perennials section of Lowes.com 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.…. The flowers are mostly five-petalled and yellow. Perforate St John’s Wort Plants. This plant grows tall, with the flowers growing at the upper half. John 's Wort and other Hypericum outdoors from seeds the St John Wort! Companion plant for many of your other plants to 1\ '' diameter ) with numerous, yellow look... This lovely herb moist, but avoid constant 'wet feet. 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