It produces thick and extensive roots called rhizomes, orangey-yellow inside, and spreads by fragments of rhizome. 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Identify Japanese knotweed. Infrastructure – Knotweed’s stout rhizomes (underground stems) are notorious for pushing through asphalt, building foundations, concrete retaining walls and even drains, causing significant damage. Torontonians should be fighting back against an invasive plant species that's threatening to take over parts of this city, but there's a problem — it's kind of pretty. A very, very problematic species. An estimate put the cost of control, were it to be attempted UK-wide, at over £1.56 billion. Japanese knotweed (Reynoutria japonica / Fallopia japonica) is the most common species of the plant found in the UK, however, it has been known to hybridise with related species. A piece the size of your thumbnail is sufficient. When disturbed, the plant can grow very quickly and its roots spread extensively. Safety – Knotweed is capable of obscuring railway signals and road signs as well as causing trip hazards in paving. Water quality and flood risk – Aquatic organisms are less able to process knotweed leaf litter compared with the native vegetation it displaces and this has the potential to alter food chains. Contaminated soil should be treated as controlled waste. While you may be able to describe your garden and the … The Japanese Knotweed plants in Japan also have the local pests and diseases to contend with and suffer predation from a whole range of invertebrates and fungi. Japanese knotweed is a member of the buckwheat family.   It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. Originally imported as an attractive garden plant it is now a widespread and unwelcome alien plant. Japanese Knotweed was introduced to the United Kingdom from Japan in 1825 as an ornamental plant, but without the pests and diseases that control it in Japan, it grows and spreads rapidly in “non-native” Europe and the USA, and it is now a serious problem in a range of habitats, particularly roadsides, riverbanks and derelict land. Recent studies led by the CABI team in Switzerland have proved that knotweed areas suffer reduced species diversity. Identifying Japanese Knotweed . It can seriously damage buildings and construction sites if left unchecked. It is accepted that the distance Japanese Knotweed can spread underground is a maximum of 7m. Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. You can have Japanese knotweed growing on your property and, unless required to do so under a Community Protection Notice (see below), there is no requirement to take any action to deal with it. Problems with Japanese knotweed. The biggest problem with Japanese Knotweed is that it’s undesirable. It only takes one property owner to pull out and all the other properties are then put at risk. Japanese Knotweed grows in a wide range of habitats including riparian areas, wetlands, roadsides, ditches, utility right of ways and fence lines. Caused the Japanese knotweed on your property to spread into the wild. This would contravene the Wildlife & Countryside Act 1981 (as amended). This will then be carried out, usually by applying herbicide once or twice in the first year and then once each following year until the plant no longer reappears. In the UK, Japanese Knotweed is established in the wild in many parts of the country and creates problems due to the impact on biodiversity, flooding management and damage to property. “PCA®” and the PCA logo are registered trademarks of the Property Care Association. In order to ensure that the advice and management you contract is reliable and recognised by mortgage lenders and other relevant agencies, you should contact a company which is a member of the Invasive Weed Control Group of the Property Care Association. Japanese knotweed is one of a number of invasive plants that can cause problems to your property: What are the problems caused by Japanese knotweed? Asphalt, patio slabs, driveway block paving will pose no problem to Japanese Knotweed on its unstoppable quest for light. One could say it has an unfair advantage over native species because the controlling influence of the many insects and fungi that attack the plant in its native range has been removed. Like most websites we use cookies. It requires constant maintenance to prevent it taking over an entire garden, and is extremely difficult (and therefore expensive) to eradicate entirely. The plan should include or be accompanied by an estimate of costs. “This means if an individual or organisation is not controlling Japanese knotweed or other invasive plants and could be reasonably expected to do so, the notice could be used after a mandatory written warning has been served beforehand to get them to stop the anti-social behaviour”. What is Japanese knotweed? Japanese knotweed could be more effective than antibiotics at tackling the growing problem of Lyme disease. Japanese knotweed causes problems in gardens owing to its invasive nature and its habit of out-competing all plants growing nearby. (Japanese knotweed is a Schedule 9 listed plant). A site assessment, in person, by an expert. Why is that such a problem? Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. means you agree to our use of cookies. 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