An increasing number of mortgage providers are refusing applications for properties where knotweed is revealed to be present (, cost of control, were it to be attempted UK-wide, at over £1.56 billion, cost of eradication, were it to be attempted UK-wide, could be more than  £1.56 billion. While you may be able to describe your garden and the … Japanese knotweed, also known as Asian knotweed, was first introduced to the Netherlands in the 19th century as an ornamental plant, but the species is now notoriously invasive. It grows at a phenomenal rate, is near-impossible to get rid of and has ruined house sales – wiping thousands off property prices. It is commonly known as Asian knotweed or Japanese knotweed. This, combined with its zombie-like refusal to die, has made it into a … Identifying Japanese Knotweed . However, it’s also a problem in the wild. In order to ensure that Japanese knotweed on your land is effectively and completely treated, you need to obtain professional advice. Asked July 15, 2020, 5:40 PM EDT. A notice could require an individual or organisation to make reasonable efforts to make good the problems arising as a result of Japanese knotweed within a specified period of time and/or a requirement to take reasonable steps to prevent future occurrence of the problem. It is visually unappealing and can block panoramic viewpoints. Over many years, Japanese knotweed has acquired a reputation as one of the most invasive plants, and has been blamed for causing damage to properties. Fax: 01480 417587, The Property Care Association is a company limited by guarantee and registered in England: No. Why is Japanese knotweed such a problem? Dealing with the problem of Japanese knotweed on next door’s land. Over the winter the plant dies back leaving tall brown canes but as a perennial plant its top growth is renewed each year from the rhizomes which can spread relentlessly. Once agreement has been reached, a plan drawn up and costs agreed, a solicitor should be employed to arrange a contract between all parties. Scientists found that antibiotics over … Japanese knotweed causes problems in gardens owing to its invasive nature and its habit of out-competing all plants growing nearby. 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. Breach of any requirement of a Community Protection Notice, without reasonable excuse, would be a criminal offence, subject to a fixed penalty notice (which attracts a penalty of £100) or prosecution. Japanese knotweed is a very serious invasive. JK Injection Tools is a company that has worked on the problem of making herbicide injection a practical method for removing Japanese knotweed. Not only does the presence of Japanese 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. NEW Online Surveyor Training: Timber & Dampness in Building, Welcome to The Property Care Association » Homeowners » Invasive Weed Control » A Guide to the Problems Caused by Japanese knotweed. 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. Typically, a plan will be produced for your approval with costs provided. They have even found evidence of allelopathy (the release of chemicals that suppress the growth of other plants). This species causes significant changes to the communities and ecosystems it inhabits, including visual, structural, and chemical transformations of ecosystems, which are a result of its large and clonal monocultural growth [3]. Japanese knotweed is a notorious non-native species in the UK, and elsewhere in Europe and North America.   It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. It produces thick and extensive roots called rhizomes, orangey-yellow inside, and spreads by fragments of rhizome. Japanese Knotweed grows in a wide range of habitats including riparian areas, wetlands, roadsides, ditches, utility right of ways and fence lines. Most properties do not have Japanese knotweed growing on them. Infrastructure – Knotweed’s stout rhizomes (underground stems) are notorious for pushing through asphalt, building foundations, concrete retaining walls and even drains, causing significant damage. Huntingdon Hinchingbrooke What is Japanese Knotweed. The stem is … Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. Our native species have not taken a shine to knotweed and very few if any insects or fungi can be found on the plant even after almost 200 years. Contaminated soil should be treated as controlled waste. Asphalt, patio slabs, driveway block paving will pose no problem to Japanese Knotweed on its unstoppable quest for light. It is a common sight along railway banks and at train stations, and along canal towpaths. Sadly Japanese knotweed has escaped and/or been dumped in the wild, where it quickly spreads and threatens natural ecosystems. It has been described as having the biodiversity value of concrete! Local councils and the police have the power to issue Community Protection Notices against “individuals who are acting unreasonably and who persistently or continually act in a way that has a detrimental effect on the quality of life of those in the locality” including for invasive non-native species like Japanese knotweed. The problem. As with other plants, the pressure exerted by the expanding rhizome (or roots) can split structures along weak points and push up through car parks and drives where the asphalt has been poorly laid. 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. … Why is Japanese Knotweed a problem? In winter, the riverbanks become exposed when the knotweed dies back, increasing erosion and silting fish spawning gravels. Why is Japanese knotweed a problem? On summary conviction, an individual would be liable to a level 4 fine. The biggest problem with Japanese Knotweed is that it’s undesirable. It is native to East Asia in Japan, China and Korea. In some instances, Japanese knotweed can have been introduced to or spread along a number of properties. In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. Basically, if water can drain down into it, Japanese knotweed can grow up through it. ensure that tools, machinery and other equipment brought onto your property is clean and free from fragments of rhizome. Dug up or cut down and then removed the plant from your property. According to the UK government, the cost of controlling existing Japanese Knotweed had risen to £1.25 billion in 2014. Japanese knotweed is one of a number of invasive plants that can cause problems to your property: It’s a large clump-forming plant, which grows up to 3m tall, with light green shield-shaped leaves with a flattened base, approximately 10-15cm long. Costs – Japanese knotweed costs Great Britain an estimated £165m every year (Williams et al 2010) and the cost of eradication, were it to be attempted UK-wide, could be more than  £1.56 billion. The plan should include or be accompanied by an estimate of costs. Achieving collaboration in such a case is more challenging and it would be advisable to take expert advice from the Japanese knotweed specialist. This would contravene the Wildlife & Countryside Act 1981 (as amended). Japanese Knotweed is not the demon plant that can shatter concrete and undermine buildings that everyone believes, according to new research. 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