Japanese knotweed (Reynoutria japonica) is a highly invasive plant species that can cause significant damage to properties if left uncontrolled. Its rapid growth and tenacious nature make it a major concern for homeowners, particularly when it appears in neighbouring land.
Discovering Japanese knotweed in your neighbour’s garden can be a cause for concern. This invasive weed has the potential to spread rapidly and cause damage to your own property if left uncontrolled.
Our specialists at Knotweed Specialists UK are here to provide you with a step-by-step guide on what to do if your neighbour has Japanese knotweed, helping you navigate the situation effectively and protect your property.
What is Japanese Knotweed?
Japanese knotweed is a perennial plant native to Eastern Asia that was introduced to the Western world as an ornamental plant. It has now become a widespread problem due to its ability to quickly spread and its resilience in different environments.
It can cause significant damage to buildings and infrastructure if left unchecked. Its extensive root system can penetrate through weak points in foundations, walls, and drainage systems, leading to structural damage and potential instability. The plant’s vigorous growth can also exploit existing defects in walls and fences, accelerating deterioration.
The plant can grow up to three metres in height and has distinctive heart-shaped leaves. Its bamboo-like stems and clusters of white flowers make it easily identifiable. Learn how to effectively spot Japanese knotweed here.

What To Do If Your Neighbour Has Japanese Knotweed?
Understand the Risks of Japanese Knotweed
Start by learning about Japanese knotweed and its characteristics. Understand how it spreads, its growth patterns, and the potential damage it can cause. This knowledge will enable you to address the issue more effectively and engage in informed conversations with your neighbour. Potential risks associated with Japanese knotweed include:
- Property damage
- Decreased property value
- Legal and financial consequences
- Soil erosion
- Increased flooding risk
Communicate with Your Neighbour
If you spot Japanese knotweed on a neighbouring property it’s important to approach them in a polite and friendly manner to discuss the presence of the knotweed. Raise your concerns and explain the potential risks it poses to both properties.
Raising awareness about the invasive nature of Japanese knotweed and the problems it can cause is crucial since many individuals may not be familiar with these aspects. Therefore, educating them about the plant becomes the initial and essential step in seeking a viable solution.
Share Information
Share information with your neighbour through leaflets, websites or contact details of local Japanese knotweed Removal experts such as ourselves who specialise in effective management and control. Sharing credible information with your neighbours will help them understand the severity of the issues and the importance of taking action to prevent the spread of Japanese knotweed.
This expert advice will encourage your neighbour to make informed decisions and take effective measures to address the issue promptly and efficiently.
Work With Your Neighbour to Resolve the Issue
Suggest sharing the cost of professional Japanese knotweed removal services, particularly with specialists that offer insurance-backed guarantees and long-term management plans for effective control, regrowth, and minimising the risk of future infestations.
By addressing the issue collectively and investing in reliable expertise, both parties benefit from reduced risk of further spread and a more comprehensive and lasting solution.
Document the Situation
Keep a record of your conversations, including dates, details discussed, and any agreements made. This documentation can serve as evidence of your efforts to resolve the issue amicably. If legal action becomes necessary later on, these records will prove valuable.
Consider Legal Action
While it is advisable to resolve the matter through communication and cooperation, legal advice and action may be necessary. Under the Environmental Protection Act Regulations 1991, Japanese knotweed is classed as ‘controlled waste’ and should be disposed of safely, therefore if your neighbour fails to take proper precautions, it can result in legal obligations.
If your neighbour refuses to take action or denies the presence of Japanese knotweed, we would recommend consulting a solicitor or legal expert to understand your rights and options.
Monitor Your Property
As your neighbour addresses the Japanese knotweed problem, it is important to remain vigilant and monitor your own property for any signs of a knotweed infestation. Early detection is key, and immediate action can help prevent Japanese knotweed from growing in your garden.
If you suspect an infestation of knotweed on your property, it is advisable to call a knotweed removal specialist such as ourselves for a professional Japanese knotweed site survey and guidance on appropriate measures to address the issue effectively.

FAQs
Can I Sue My Neighbour for Japanese Knotweed?
While laws regarding Japanese knotweed may vary depending on the jurisdiction, it is possible to take legal action against a neighbour if their Japanese knotweed infestation causes damage or spreads onto your property.
However, it is advisable to first attempt an amicable resolution through communication and cooperation. If that fails, consulting a solicitor or legal expert can help you understand your rights and options for pursuing legal action if necessary.
Can I Sell My House if My Neighbour Has Japanese Knotweed?
Selling a house when your neighbour has Japanese knotweed can be challenging. Potential buyers and mortgage lenders may be wary due to the potential risks and the difficulty of eradicating the plant.
It is important to disclose the presence of Japanese knotweed to both the buyer and their solicitor. Working with a specialist removal company such as Knotweed Specialists UK to develop a management plan and provide evidence of ongoing treatment can help reassure buyers and facilitate the sale.
Local Japanese Knotweed Removal Specialists
At Knotweed Specialists UK, we are experts in Japanese knotweed removal in Hampshire and West Sussex. With our extensive experience, we specialise in identifying, controlling, and removing this invasive plant to prevent its further spread.
Whether it’s residential or commercial properties, our dedicated team of experts have successfully removed Japanese knotweed from numerous sites over the years. Trust us to provide professional and effective solutions for your Japanese knotweed concerns.









