Washington Invasive Species Council. Japanese knotweed is a perennial herbaceous plant. Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. Why is it a problem? Scientific name: Reynoutria japonica var. Its scientific name is Fallopia Japonica but the family also includes derivatives such as Giant Knotweed and Himalayan Knotweed. Smithsonian Environmental Research Center. Pleuropterus zuccarinii . If the Japanese Knotweed is in an aquatic habitat, you will need to use a product such as Rodeo or AquaNeat. North Carolina State University. The significance of Japanese knotweed (scientific name Fallopia japonica), and the potential problems it can bring, has been the subject of increased publicity in recent years as accounts of it pushing its way through tarmac and concrete and growing at excessive rates have been reported. It spreads by water dispersed seeds and through transport by humans. The stems are reddish-brown and freely branched. After careful analysis, APHIS has determined that releasing Japanese knotweed psyllid within the continental United States is not likely to have a significant impact on the environment. GRIN-Global. Marine Invasions Research Lab. Fallopia japonica . It was first introduced to the UK in the mid nineteenth century as an ornamental plant. Provides state, county, point and GIS data. japonica in the UK. Alaska Center for Conservation Science. While Japanese knotweed was originally placed in the large genus Polygonum (see below), taxonomists in Europe have long seen reason to separate this and closely related species taxonomically. The common name in English is Japanese knotweed. Wisconsin Department of Natural Resources. Japanese Knotweed Japanese knotweed, scientific name Fallopia japonica, is a perennial plant with a matrix of vigorous underground stems called rhizomes.It has distinctive, branching, hollow, bamboo-like stems, covered in purple speckles, often reaching 2-3 m high. The fruits are small, brown, and triangular in shape and mature from September to January. Colorado Department of Agriculture. Japanese knotweed is a member of the buckwheat family. Animal and Plant Health Inspection Service. USDA. Scientific Name: Polygonum cuspidatum. Polygonum zuccarinii . Google. Water and Land Resources Division. Family Polygonaceae Scientific Name Polygonum cuspidatum ← → Other Common Names: Japanese bamboo. Center for Environmental Research and Conservation. The stems are reddish-brown and freely branched. It is the most invasive plant in Britain. Plant Control: Apply a glyphosate herbicide in combination with cutting. Japanese knotweed plants in Europe and North America ar… It is native to East Asia in Japan, China and Korea. Common Name: Japanese knotweed, Mexican bamboo. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar. National Genetic Resources Program. Columbia University. Glyphosate by itself will not harm aquatic habitats but surfactant-loaded glyphosate formulations like Roundup can be highly toxic to amphibians, frogs, and other aquatic fauna. Scientific name: Fallopia japonica AKA: Japanese Bamboo, Pysen saethwr (Welsh), Polygonum cuspidatum, Reynoutria japonica Native to: Japan, Taiwan, northern China Habitat: Common in urban areas, particularly on waste land, railways, road sides and river banks. A paper published in the 1980's placed species from the Tiniaria and Reynoutria genera (see below) together in the genus Fallopia , based on flower morphology (see Ronse Decraene, L.-P. and J. R. Akeroyd (1988). Scientific Name: Polygonum cuspidatum (most common name in U.S. and Japan), also known as Reynoutria japonica (most common in U.K. and Europe), a movement exists to standardize name as Fallopia japonica. It grows in Asian countries from South China including Taiwan and Japan to east Asia. For information specific to the activity of resveratrol, see … Huzhang (Japanese Knotweed) has been used in traditional Chinese medicine as well as in Japan and Korea for many years. The closely related Fallopia sachalinensis can hybridize with F. japonica to form Fallopia x bohemica, first described in 1983, which is proving to be more problematic than F. japonica var. Tall herbaceous perennial with bamboo like stems. Going Native: Urban Landscaping for Wildlife with Native Plants. – Japanese knotweed Conservation Services Division. Alternative Native Species: Virginia Willow (Itea virginica), Sweet Pepperbush (Clethra alnifolia). Pennsylvania State University. Indiana Department of Natural Resources. See also: Included on California's noxious weed list; see. It is the most invasive plant in Guernsey (and in Britain). Other scientific names that have been associated with Fallopia Japonica have included the following: Polygonum reynoutria (Makino) Cooperative Extension. Spring growth: red/purple coloured shoots COMMON PROBLEMS ASSOCIATED WITH JAPANESE KNOTWEED Damage to paving, tarmac, asphalt, driveways, car parks, etc, as shoots push through them. University of Alaska - Anchorage. It presents a pleasing appearance to the eye: heart-shaped leaves, bamboo stems and pretty, little white-flower tassels. Ontario's Invading Species Awareness Program (Canada). The scientific names of Polygonum cuspidatumor Reynoutria japonicaare also used. Extension. Japanese knotweed, fleeceflower, Mexican bamboo, huzhang. japonica (previously Fallopia japonica) Other Schedule 9 Species: Dwarf knotweed, Giant knotweed, Bohemian (hybrid) knotweed What is Japanese knotweed? Reynoutria japonica . Its scientific name is Lyme Borreliosis. Is It Here Yet? Ecology: Japanese Knotweed forms dense stands and aggressively outcompetes native vegetation. Australian Government. Michigan Department of Natural Resource; Michigan State University Extension. Japanese Knotweed (Fallopia japonica) is an invasive, perennial herbaceous plant that is also known as Mexican Bamboo, Fleeceflower, Japanese Polygonum or Huzhang. Michigan Natural Features Inventory. Japanese knotweed (scientific name Fallopia japonica), is sometimes known locally as donkey rhubarb. Persicaria japonica Nakai. Invasive Plant Species Assessment Working Group. It is commonly known as Asian knotweed or Japanese knotweed. The U.S. Department of Agriculture's Animal and Plant Health Inspection Service (APHIS) has issued the final environmental assessment (EA) for releasing Japanese knotweed psyllid (Aphalara itadori) to manage Japanese, giant, and bohemian knotweeds (Fallopia japonica, F. sachalinensis, and their hybrid, F. x bohemica). It was prized and planted in many famous gardens. It is a very aggressive escaped ornamental that is capable of forming dense stands, crowding out all other vegetation and degrading wildlife habitat. It goes by the name of Japanese knotweed, or Fallopia japonica. This infectious disease is caused via the bite of an infected tick. Noxious Weed Program. Pennsylvania State University. The plant arrived from Japan to the U.K. and then to North America in the 19th century as a landscaping ornamental. In the late 1800s, it was brought to the United States and was planted in gardens and used for erosion control along roadways and embankments. Department of the Environment and Energy. National Invasive Species Information Center, Early Detection & Distribution Mapping System (EDDMapS) - Japanese Knotweed, Invasive Plants of Ohio: Fact Sheet 10 - Japanese Knotweed (PDF | 254 KB), Southeast Exotic Pest Plant Council Invasive Plant Manual - Japanese Knotweed, Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Japanese Knotweed, Giant Knotweed, Bohemian Knotweed (Feb 7, 2011) (PDF | 304 KB), Invasive Plant Atlas of the United States - Japanese Knotweed, New York Invasive Species Information - Japanese Knotweed, Non-native Species Information: Japanese Knotweed, National Exotic Marine and Estuarine Species Information System (NEMESIS): Chesapeake Bay Introduced Species Database -, New Hampshire's Prohibited Invasive Plant Fact Sheets, Invasive Species Best Control Practices - Japanese Knotweed (2012) (PDF | 373 KB), Invasive Plant Species Fact Sheet: Japanese Knotweed (2006) (PDF | 734 KB), Field Guide: Invasive - Japanese Knotweed, Invasive Plants in Pennsylvania: Japanese Knotweed and Giant Knotweed (PDF | 162 KB), King County (Washington) Noxious Weed Control Program - Japanese Knotweed, Noxious Weed Species - Japanese, Giant, and Bohemian Knotweeds, Introduced Species Summary Project - Japanese Knotweed, Invasive Plants and Insects: Japanese and Giant Knotweed, Invasive, Exotic Plants of the Southeast - Japanese Knotweed, Maine Invasive Plants Bulletin: Japanese Knotweed / Mexican Bamboo, Ohio Perennial & Biennial Weed Guide - Japanese Knotweed. 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