This could include allowing the plant to spread from your property into the neighbouring land by its rhizomes extending underground into the adjacent land. Do I need a Japanese knotweed site survey? 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? How to avoid problems with Japanese knotweed and keep it out! But it holds the title of the UK's most invasive plant and has become the subject of horror stories. 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’. Call the PCA: 01480 400000 Email:, The Property Care Association What is Japanese Knotweed. In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. In fact, all mortgage providers now refuse to lend on property that has knotweed present. 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. However, it’s also a problem in the wild. In some cases, lenders have simply rejected applications for a mortgage, unprepared to accept a Japanese knotweed management plan. “PCA®” and the PCA logo are registered trademarks of the Property Care Association. | 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. means you agree to our use of cookies. A follow up report which would usually be a Japanese knotweed management plan. 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. It can seriously damage buildings and construction sites if left unchecked. Japanese knotweed is a notorious non-native species in the UK, and elsewhere in Europe and North America. It would however be advisable to take measures to eradicate the plant, but there are no regulations forcing you to do so. The plan should include or be accompanied by an estimate of costs. 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. Originally imported as an attractive garden plant it is now a widespread and unwelcome alien plant. Achieving collaboration in such a case is more challenging and it would be advisable to take expert advice from the Japanese knotweed specialist. 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. Typically, a plan will be produced for your approval with costs provided. 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. 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. 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. 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. 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. A very, very problematic species. Fragments of rhizome get picked up in soil and on equipment. It requires constant maintenance to prevent it taking over an entire garden, and is extremely difficult (and therefore expensive) to eradicate entirely. Why is Japanese knotweed a problem? Japanese knotweed is a very serious invasive. In Japan, the plant generally grows in harmony with the environment and is not considered to be invasive. What is Japanese knotweed? You must prevent Japanese knotweed on … 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. Not only does the presence of Japanese Huntingdon There are only female plants in Britain, so no viable seeds are produced. The stem is … 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. 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. 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