Frequently Asked Questions
Find answers to the most common questions about Japanese Knotweed
Japanese Knotweed (Fallopia japonica) is a highly invasive perennial plant native to East Asia. It was introduced to the UK in the 19th century as an ornamental plant and has since spread extensively. It can grow up to 10cm per day and its root system (rhizome) can extend up to 7 metres horizontally and 3 metres deep.
While Japanese Knotweed poses no direct health risk to humans, it can cause significant structural damage to buildings, foundations, walls, paving, and drainage systems. Its presence can also affect property values and mortgage eligibility.
Key identification features include: heart or shield-shaped green leaves arranged in a zigzag pattern along the stem, bamboo-like hollow stems with distinctive purple speckles, and creamy white flower clusters in late summer. If you're unsure, use our free identification service.
DIY removal is strongly discouraged. Improper handling can cause the plant to spread further. Japanese Knotweed is classified as controlled waste under UK law — it must be disposed of at licensed landfill sites. Always use a professional, certified treatment provider.
Treatment typically involves a herbicide programme over 2-3 growing seasons for complete eradication. More rapid solutions like excavation and thermo-electric treatment are available depending on your needs and timeline.
Many UK mortgage lenders require a professional Knotweed management plan with an insurance-backed guarantee before approving loans on affected properties. Our treatment plans are designed to satisfy lender requirements.
Yes, if Japanese Knotweed has encroached onto your property from neighbouring land, you may be entitled to compensation. Our panel of specialist solicitors can assess your case and advise on potential claims covering treatment costs, property devaluation, and legal fees.
An insurance-backed guarantee (IBG) provides long-term assurance that the treatment will be completed and any regrowth dealt with, even if the original treatment company ceases trading. This is often a requirement for mortgage lenders and property sales.