page_title: Hypericum
section_title: Ornamental plants
hierarchical_section_title: Hypericum / Ornamental plants
caption_attribution_description: English: Hypericum olympicum in Botanical Garden Liberec, Czech Republic Čeština: Třezalka olympská, Hypericum olympicum v Botanické zahradě v Liberci, severní Čechy
context_page_description: Hypericum is a genus of flowering plants in the family Hypericaceae. The genus has a nearly worldwide distribution, missing only from tropical lowlands, deserts and polar regions. Many Hypericum species are regarded as invasive species and noxious weeds. All members of the genus may be referred to as St. John's wort, and some are known as goatweed. The white or pink flowered marsh St. John's worts of North American and eastern Asia are now separated into the genus Triadenum.
  Hypericum is unusual for a genus of its size because a worldwide taxonomic monograph was produced for it by Norman Robson. Robson recognizes 36 sections within Hypericum.
context_section_description: Some species are used as ornamental plants as many have large, showy flowers. Species found in cultivation include: 
  H. aegypticum
  H. androsaemum
  H. balearicum
  H. bellum
  H. calycinum
  H. elodes
  H. forrestii
  H. kalmianum
  H. kouytchense
  H. olympicum
  H. perforatum
  Numerous hybrids and cultivars have been developed for use in horticulture, such as H. × moserianum (H. calycinum × H. patulum), H. 'Hidcote' and H. 'Rowallane'. All of the above cultivars have gained the Royal Horticultural Society's Award of Garden Merit.
  Most species of Hypericum are prone to thrips, scale, anthracnose, rust, and leaf spots. They are also eaten or infected by aphids,  white flies, and spodoptera littoralis.
caption: Hypericum olympicum in Botanic garden Liberec
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