This plant and synonym italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Family: Smartweed, Polygonaceae.. Habitat: The species occupies a wide variety of habitats in many soil types and a range of moisture conditions.It is most common along roadsides and on stream banks, but is also found in low-lying areas, utility rights-of-way, old home sites and along woodland edges and openings. It is a robust, bamboo-like perennial that spreads by long creeping rhizomes to form dense thickets. Overview Information Knotweed is an herb. photo credit Tom Heutte, bugwood.org . Japanese knotweed . Clinical Overview Use. Because Japanese knotweed is classified as âcontrolled wasteâ by the 1990 Environmental Protection Act, many places, like the United Kingdom, require you to dispose of it at a licensed landfill site. long by 3 in. Find out what Japanese knotweed ⦠Japanese knotweed is a highly invasive plant and one that can cause damage to property in its path. Japanese Knotweed in property: What you need to know Japanese Knotweed, as you might have guessed from the name, is not a native plant to the UK. It was brought in from Japan, Korea and China in the 19th century and has spread rapidly across the UK since then. Japanese Knotweed. Originally imported as an ornamental screen or hedge plant, Japanese knotweed ⦠Environet are the UKâs leading specialists in Japanese knotweed eradication and our trademarked solutions are suitable for both commercial and residential properties.. For more than the 20 years, our teams have been helping business and homeowners across the UK battle against this harmful weed. A thicket of Japanese knotweed. Back to Invasive Plant Photos and Information. Japanese Knotweed, (Fallopia japonica), is 'indisputably the UKâs most aggressive, destructive and invasive plant' affecting houses and gardens. Huzhang (Japanese Knotweed) has been used in traditional Chinese medicine as well as in Japan and Korea for ⦠Last updated on Dec 25, 2019. Japanese knotweed Polygonum cuspidatum, Japanese knotweed. & Zucc. wide, oval with smooth margins; stems similar to bamboo, but on new foliage a membranous sheath surrounds area where stem and leaf meet; ⦠It is similar to Japanese knotweed in many respects but is larger, growing over 4m high and having leaves around 20-40cm long. Look up the regulations concerning Japanese knotweed in your area. It has also escaped into the wild where it is spreading. Scientific Name(s): Polygonum cuspidatum Siebold & Zucc. Common Name(s): Fleeceflower, Huzhang, Japanese bamboo, Japanese knotweed, Mexican bamboo Medically reviewed by Drugs.com. Japanese Knotweed (sometimes spelt Japanese Knot weed) is a non-native, alien invasive plant species, originally from Japan & Northern China and it was first introduced to Europe in the 19 th Century.. Japanese Knotweed was first introduced to Britain by the Victorians as an ornamental plant â and was actually awarded a gold medal at a prestigious flower show. As with Japanese knotweed it was brought to Europe to be grown in botanical gardens. Japanese Knotweed. Japanese knotweed (Japanese bamboo) Polygonum cuspidatum. Life cycle: herbaceous perennial Growth habit: grows up to 10 ft. high; shrubby; leaves 6 in. ), a member of the buckwheat family, was introduced into the U.S. from Eastern Asia (Japan, China, Korea) as an ornamental on estates in the late-1800s. Japanese knotweed (Polygonum cuspidatum Sieb. Citation: Tom Heutte, USDA Forest Service, www.invasives.org Background. The whole flowering plant is used to make medicine. 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