What is Japanese knotweed? 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. The mortgage lenders recognise the standards and professionalism of such a trade association along with the assurance that comes with their work. 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. Glyphosate has a remarkably low toxicity to humans and other animals and it becomes inactivated, effectively harmless, on contact with soil. Prevent spread of Japanese knotweed. The plant's vast root system exploits weaknesses in building foundations and drainage systems, often making buildings structurally unsound. Share. Call the PCA: 01480 400000 Email: pca@property-care.org, The Property Care Association 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.   It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. Japanese Knotweed problem. In North America and Europe, the species has successfully established itself in numerous habitats, and is classified as a pest and invasive species in several countries. A piece the size of your thumbnail is sufficient. Once agreement has been reached, a plan drawn up and costs agreed, a solicitor should be employed to arrange a contract between all parties. It produces thick and extensive roots called rhizomes, orangey-yellow inside, and spreads by fragments of rhizome. Why Japanese Knotweed is Such a Problem The invasive nature of the knotweed will soon becomes apparent once it has been identified. It is a common sight along railway banks and at train stations, and along canal towpaths. clean soil and plant debris from outdoor footwear and vehicles after being out and about. Why is that such a problem? The plan should include consideration of the options for control and an explanation as to how the recommended action was arrived at. It grows at a phenomenal rate, is near-impossible to get rid of and has ruined house sales – wiping thousands off property prices. Why is Japanese knotweed such a problem? 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. When disturbed, the plant can grow very quickly and its roots spread extensively. 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. Dug up or cut down and then removed the plant from your property. Home » Knowledge Centre » Is Japanese Knotweed really a problem for home owners? Japanese knotweed has to be removed from the 2012 Olympic site in east London. This problem was eased when the Royal Institution of Chartered Surveyors introduced its assessment framework (2012) which ranked the risk of the plant into four categories. A common occurrence is where the Japanese knotweed on your property extends into the next door neighbour’s plot or your property is free of the weed but it is within 7m of a boundary on adjacent land. Now recognised as one of the most problematic weeds … A follow up report which would usually be a Japanese knotweed management plan. They have even found evidence of allelopathy (the release of chemicals that suppress the growth of other plants). 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. A site assessment, in person, by an expert. But it holds the title of the UK's most invasive plant and has become the subject of horror stories. 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? Basically, if water can drain down into it, Japanese knotweed can grow up through it. 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. It is commonly known as Asian knotweed or Japanese knotweed. Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. It requires constant maintenance to prevent it taking over an entire garden, and is extremely difficult (and therefore expensive) to eradicate entirely. It is when a plant is introduced to a new setting without these pests and diseases that they … The flowers are tiny and clustered together in creamy-white sprays, present from August to October. Its extensive rhizome (root) system can cause major problems for public and private infrastructure. Achieving collaboration in such a case is more challenging and it would be advisable to take expert advice from the Japanese knotweed specialist. History. 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. 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. 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. This is based on criteria advised by the Royal Institution of Chartered Surveyors. 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. Do you have problems with Japanese Knotweed we can help you fix the problem. 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. How to identify Japanese knotweed.. I have been fighting the Japanese Knotweed in my back yard for years, Last year I did extensive research on this invasive weed. It would however be advisable to take measures to eradicate the plant, but there are no regulations forcing you to do so. “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”. Profuse knotweed canes also reduce the capacity of river channels to carry floodwater, as well as blocking sluices and grids. This, combined with its zombie-like refusal to die, has made it into a … In fact, all mortgage providers now refuse to lend on property that has knotweed present. 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. 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. The herbicide used is most likely to be Glyphosate and the application can only be undertaken by an appropriately certificated operative. Asphalt, patio slabs, driveway block paving will pose no problem to Japanese Knotweed on its unstoppable quest for light. Housing devaluation – Knotweed found on or close to a property can have an impact on its actual and perceived value. It is accepted that the distance Japanese Knotweed can spread underground is a maximum of 7m. It is visually unappealing and can block panoramic viewpoints. This would contravene the Wildlife & Countryside Act 1981 (as amended). In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. Consulting and contracting an expert According to the UK government, the cost of controlling existing Japanese Knotweed had risen to £1.25 billion in 2014. When growing adjacent to built structures such as walls and buildings, the rhizome can damage structures exploiting cracks and weaknesses as the rhizome system expands. 5596488. 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. Designed & Developed by Design Monkey - Cambridge Website Design, Content Copyright © 2020 Property Care Association - All rights reserved. Infrastructure – Knotweed’s stout rhizomes (underground stems) are notorious for pushing through asphalt, building foundations, concrete retaining walls and even drains, causing significant damage. JK Injection Tools is a company that has worked on the problem of making herbicide injection a practical method for removing Japanese knotweed. In some cases, lenders have simply rejected applications for a mortgage, unprepared to accept a Japanese knotweed management plan. (Japanese knotweed is a Schedule 9 listed plant). Scientists found that antibiotics over … This can add huge costs to development and regeneration schemes. 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. 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. Concrete – It may be strong but not even Japanese Knotweed can grow through concrete. Japanese knotweed rhizomes in their search for moisture can interfere with drainage pipes and other structures, blocking and sometimes lifting the pipework and clogging sumps. 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. The problem. “PCA®” and the PCA logo are registered trademarks of the Property Care Association. Under the provisions made within Schedule 9 of the Wildlife and Countryside Act 1981, it is an offence to cause Japanese knotweed to grow in the wild. A very, very problematic species. Minimise the risk of your property being invaded. Japanese Knotweed is a highly invasive plant which is extremely difficult to eradicate from land due to the fact that it spreads by its roots and stems, and can spread very rapidly. 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’. Why is Japanese knotweed a problem? Just like alien invasive species, Japanese Knotweed poses a host of problems that add up to significant environmental and economic impact. Japanese Knotweed Fix. If relevant you should be offered an appropriate warranty for the work that is proposed. 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]. An organisation, such as a company, is liable to a fine not exceeding £20,000. In winter, the riverbanks become exposed when the knotweed dies back, increasing erosion and silting fish spawning gravels. Japanese knotweed is a member of the buckwheat family. Facebook; LinkedIn; Twitter; Reasons to choose Wilson Browne Japanese Knotweed, also known as Asian Knotweed, is a large herbaceous perennial plant. 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. 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. On summary conviction, an individual would be liable to a level 4 fine. The plant arrived from Japan to the U.K. and then to North America in the 19th century as a landscaping ornamental. It normally finds a weak spot, pushes through and then expands as it goes to cause damage. Japanese Knotweed is not the demon plant that can shatter concrete and undermine buildings that everyone believes, according to new research. How to avoid problems with Japanese knotweed and keep it out! Japanese knotweed is a notorious non-native species in the UK, and elsewhere in Europe and North America. Problems with Japanese knotweed. Giant knotweed (Fallopia sachalinensis / Reynoutria sachalinensis) is found widespread throughout the UK but is not as common as Japanese knotweed. 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. It can seriously damage buildings and construction sites if left unchecked. Like most websites we use cookies. 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. 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. Fragments of rhizome get picked up in soil and on equipment. Huntingdon A collaborative approach is by far the best way to deal with the matter and any costs to be shared. In so doing, the material becomes classed as a waste and would need to be taken to a licensed landfill site with the facilities to deal with it, this can be expensive! This could include allowing the plant to spread from your property into the neighbouring land by its rhizomes extending underground into the adjacent land. An increasing number of mortgage providers are refusing applications for properties where knotweed is revealed to be present (RICS). ensure that tools, machinery and other equipment brought onto your property is clean and free from fragments of rhizome. In order to ensure that Japanese knotweed on your land is effectively and completely treated, you need to obtain professional advice. means you agree to our use of cookies. Continuing to use www.cabi.org  But Knotweed does not always mean a mortgage is obtainable. Japanese knotweed is not native to Europe and was introduced to the UK without its natural enemies. In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. 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. The biggest problem with Japanese Knotweed is that it’s undesirable. One of the main problems is that these roots can get into weak spots or cracks in your building foundations causing damage. The plan should include or be accompanied by an estimate of costs. It only takes one property owner to pull out and all the other properties are then put at risk. Dealing with the problem of Japanese knotweed on next door’s land. Originally imported as an attractive garden plant it is now a widespread and unwelcome alien plant. Although it rarely sets seed in this country, Japanese knotweed can sprout from very small sections of rhizomes. 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. While you may be able to describe your garden and the … Why is Japanese Knotweed a problem? … Japanese knotweed causes problems in gardens owing to its invasive nature and its habit of out-competing all plants growing nearby. Not only does the presence of Japanese Where Japanese knotweed is considered to pose a risk to the property, it is usually necessary to undertake to eradicate the plant by implementing a Japanese knotweed management plan. Were it to reappear, the herbicide treatment would resume and so on. Safety – Knotweed is capable of obscuring railway signals and road signs as well as causing trip hazards in paving. 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. Biodiversity – Knotweed affects ecosystems by crowding out native vegetation and limiting plant and animal species diversity. However, updates to the guidance documents now specifically name Japanese Knotweed alongside Himalayan Balsam and Giant Hogweed as a source of “serious problems” and state that an individual failing to control the troublesome triffid will have committed a criminal offence. 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. 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. 11 Ramsay Court With bamboo-like stems and clusters of creamy flowers, Japanese knotweed sounds exotic. Japanese knotweed is a very serious invasive. It can be known to grow as much as 10cm in a single day. The stem is hollow, bamboo-like, light green speckled with pink-red. If you would like to, you can learn more about the cookies we use. Identifying Japanese Knotweed . This is to ensure that we give you the best experience possible. Dense summer foliage causes heavy shading of small streams, which reduces aquatic plant communities. 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. Japanese knotweed could be more effective than antibiotics at tackling the growing problem of Lyme disease. Hinchingbrooke It is often found around old homesteads where it may have been originally planted as an ornamental. Identify Japanese knotweed. Kingfisher Way Business. It has been described as having the biodiversity value of concrete! The stem is … Recreation – Knotweed is a nuisance to anglers, boaters and other river users as it impedes access. Most properties do not have Japanese knotweed growing on them. 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. Caused the Japanese knotweed on your property to spread into the wild. 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. 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. PE29 6FY, Email: pca@property-care.org Other underground infrastructures are at risk, such as cabling and water pipes. 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. Recent studies led by the CABI team in Switzerland have proved that knotweed areas suffer reduced species diversity. Call: 01480 400000 An estimate put the cost of control, were it to be attempted UK-wide, at over £1.56 billion. Japanese Knotweed Mortgage Problems Homeowners can find the value of their properties severely decrease and their properties become hard to sell should they be affected by Japanese Knotweed as potential buyers are often unable to obtain a mortgage on a Japanese Knotweed infested property. 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. Sadly Japanese knotweed has escaped and/or been dumped in the wild, where it quickly spreads and threatens natural ecosystems. Business Park Copyright © 2020 CABI. In fact, Japanese Knotweed is no worse for buildings than a tree or any other shrub growing nearby. | Programming Copyright © 2020 London Webmasters - All rights reserved | Legal Information and Disclaimer, A Guide to the Problems Caused by Japanese knotweed, PCA Surveyor Training for Property Professionals, Surveyor training: Timber & dampness remedial treatments, Legal Aspects – Waterproofing Surveying & Report Writing, Management of Japanese knotweed for surveyors, Evaluating Ventilation in Existing Buildings, PCA Technician Training for Property Professionals, Technician Training – Structural Waterproofing, Alternative Repair Strategies for Traditional Buildings, Condensation and Atmospheric Moisture Management in Buildings, Contracting and Client Relationship Workshop, Ground-Gas Protection: Installation & Verification, Safe Use of Biocides for Professional Users, Understanding Traditional Building Construction Principles, Training and Examinations- Terms and Conditions, How the Apprenticeship Scheme is Structured, Apprenticeship Scheme Damp & Timber Intake Dates, Surveyor & Consultant Membership Information, Invasive Weed Contractor’s Application Pack, Flood Protection Membership – Application Pack, Video Case Study: flood protection & resilience, Video: 10 steps to successful structural waterproofing projects, Logo Abuse/false claims of membership or qualifications. 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