Dense summer foliage causes heavy shading of small streams, which reduces aquatic plant communities. 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. It requires constant maintenance to prevent it taking over an entire garden, and is extremely difficult (and therefore expensive) to eradicate entirely. It is a common sight along railway banks and at train stations, and along canal towpaths. Japanese knotweed is a notorious non-native species in the UK, and elsewhere in Europe and North America. There are only female plants in Britain, so no viable seeds are produced. Recreation – Knotweed is a nuisance to anglers, boaters and other river users as it impedes access. What is Japanese knotweed? Such control methods, relying mainly on chemicals, are widely considered to be unsustainable and so a longer-term and cost effective solution to the problem is required. Japanese Knotweed Fix. It can seriously damage buildings and construction sites if left unchecked. 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. Such control methods, relying mainly on chemicals, are widely considered to be unsustainable and so a longer-term and cost effective and more environmentally friendly solution to the problem is required. Scientists found that antibiotics over … This, combined with its zombie-like refusal to die, has made it into a … Fax: 01480 417587, The Property Care Association is a company limited by guarantee and registered in England: No. Once agreement has been reached, a plan drawn up and costs agreed, a solicitor should be employed to arrange a contract between all parties. Japanese knotweed causes problems in gardens owing to its invasive nature and its habit of out-competing all plants growing nearby. Why is Japanese Knotweed a problem? “PCA®” and the PCA logo are registered trademarks of the Property Care Association. This is based on criteria advised by the Royal Institution of Chartered Surveyors. CABI is a registered EU trademark, Housing devaluation – Knotweed found on or close to a property can have an impact on its actual and perceived value. It would however be advisable to take measures to eradicate the plant, but there are no regulations forcing you to do so. Just like alien invasive species, Japanese Knotweed poses a host of problems that add up to significant environmental and economic impact. It grows at a phenomenal rate, is near-impossible to get rid of and has ruined house sales – wiping thousands off property prices. Copyright © 2020 CABI. Dealing with the problem of Japanese knotweed on next door’s land. It has been described as having the biodiversity value of concrete! Like most websites we use cookies. Infrastructure – Knotweed’s stout rhizomes (underground stems) are notorious for pushing through asphalt, building foundations, concrete retaining walls and even drains, causing significant damage. This can range from checking that you have correctly identified the plant as Japanese knotweed through to drawing up and implementing a Japanese knotweed management plan. A site assessment, in person, by an expert. Why Japanese Knotweed is Such a Problem The invasive nature of the knotweed will soon becomes apparent once it has been identified. 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]. I have been fighting the Japanese Knotweed in my back yard for years, Last year I did extensive research on this invasive weed. Asked July 15, 2020, 5:40 PM EDT. Typically, a plan will be produced for your approval with costs provided. Achieving collaboration in such a case is more challenging and it would be advisable to take expert advice from the Japanese knotweed specialist. This could include allowing the plant to spread from your property into the neighbouring land by its rhizomes extending underground into the adjacent land. The Japanese Knotweed Problem With its red stems and dark green leaves, it is an attractive plant, however, it has become the blight of British homeowners. In some instances, Japanese knotweed can have been introduced to or spread along a number of properties. Share. The property will be monitored for regrowth for the following two years and if still no regrowth, the property will be declared free of Japanese knotweed. Simple measures to take to ensure it stays that way are: These are all sound biosecurity measures that would also avoid introducing other weeds and plant diseases. Why is Japanese knotweed such a problem? But it holds the title of the UK's most invasive plant and has become the subject of horror stories. Along with other features such as damp and structural defects, surveyors will take the risk of damage from Japanese knotweed rhizome into account in their assessment of a property. The biggest problem with Japanese Knotweed is that it’s undesirable. This would contravene the Wildlife & Countryside Act 1981 (as amended). Housing devaluation – Knotweed found on or close to a property can have an impact on its actual and perceived value. Its extensive rhizome (root) system can cause major problems for public and private infrastructure. Continuing to use www.cabi.org  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. 11 Ramsay Court In some cases, lenders have simply rejected applications for a mortgage, unprepared to accept a Japanese knotweed management plan. 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. The plan should include or be accompanied by an estimate of costs. ensure that tools, machinery and other equipment brought onto your property is clean and free from fragments of rhizome. In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. On summary conviction, an individual would be liable to a level 4 fine. A decade ago, many lenders were unwilling to lend on a property where evidence of Japanese knotweed was found, ‘on the basis that it was proving too difficult to quantify the risk to the lender’. One of the main problems is that these roots can get into weak spots or cracks in your building foundations causing damage. Consulting and contracting an expert How to identify Japanese knotweed.. 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. Japanese knotweed is a very serious invasive. Basically, if water can drain down into it, Japanese knotweed can grow up through it. In order to meet the requirements of the mortgage lender the plan and its execution need to be undertaken by a member of a recognised trade association such as the Property Care Association. However, it’s also a problem in the wild. 5596488. Why is that such a problem? Do you have problems with Japanese Knotweed we can help you fix the problem. It is visually unappealing and can block panoramic viewpoints. Hinchingbrooke More recently it has become a problem with home buyers and homeowners because certain lenders are denying mortgages due to the presence of Japanese knotweed. Were it to reappear, the herbicide treatment would resume and so on. Caused the Japanese knotweed on your property to spread into the wild. In fact, Japanese Knotweed is no worse for buildings than a tree or any other shrub growing nearby. clean soil and plant debris from outdoor footwear and vehicles after being out and about. Facebook; LinkedIn; Twitter; Reasons to choose Wilson Browne Japanese Knotweed, also known as Asian Knotweed, is a large herbaceous perennial plant. Home » Knowledge Centre » Is Japanese Knotweed really a problem for home owners? The plan should include consideration of the options for control and an explanation as to how the recommended action was arrived at. Mortgage Problems If you’ve ever had the presence of Japanese Knotweed flagged up on a property survey, you’ll know how problematic it can be to get a mortgage agreed for the property and you risk losing the purchase or sale. It is often found around old homesteads where it may have been originally planted as an ornamental. 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. PE29 6FY, Email: pca@property-care.org Other underground infrastructures are at risk, such as cabling and water pipes. 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. The stem is hollow, bamboo-like, light green speckled with pink-red. Contaminated soil should be treated as controlled waste. But Knotweed does not always mean a mortgage is obtainable. 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? Problems with Japanese knotweed. Japanese Knotweed grows in a wide range of habitats including riparian areas, wetlands, roadsides, ditches, utility right of ways and fence lines. Fragments of rhizome get picked up in soil and on equipment. 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. The problem. If you disposed of it elsewhere, you would have contravened the Environmental Protection Act 1990. check that any soil brought onto your property is guaranteed to be Japanese knotweed free. It normally finds a weak spot, pushes through and then expands as it goes to cause damage. Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. 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. Safety – Knotweed is capable of obscuring railway signals and road signs as well as causing trip hazards in paving. What is Japanese Knotweed. It only takes one property owner to pull out and all the other properties are then put at risk. Kingfisher Way If you are prepared to accept the Japanese knotweed management plan and associated costs, you should be presented with a contract to agree the works with the Japanese knotweed specialist. 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. 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