Getting rid of Japanese knotweed infestation is often a difficult exercise that will consume your time, and cause exhaustion and frustration.

If your neighbour has Japanese Knotweed on their property you need to know whether this is going to impact your property and begin a nightmare to resolve unless you have a rapport with the neighbour.

The invasive nature of this weed plant makes it a menace that leaves no stone untouched in its quest to conquer every land that it grows on. The infestation of this weed plant on the neighbouring property is even worse because it means you have no control over what should happen.

Legally, there is no law that prevents one from having the weed plant on their land, however; when your neighbour has Japanese knotweed, they must bear a certain obligation to ensure the weed plant does not spread to adjacent lands/property.

Depending on the distance between the Japanese knotweed and your house, you may find that an infestation in your neighbour’s garden can have a negative effect on your property value.

To this end, the amount of money that you stand to lose from being next door to a knotweed infestation depends on the severity of the infestation and how close it is to encroach on your land.

Based on the foregoing, if your neighbour has Japanese knotweed, here is what to do and the proper cause of action that you can follow.

If your neighbour has Japanese knotweed infestation then that can impact your property and cause legal issues
If your neighbour has a Japanese knotweed infestation then that can impact your property and cause legal issues

If the Neighbour has Japanese Knotweed and to Inform them

As the first precautionary measure, it is prudent that you tell your neighbour as soon as possible regarding the presence of the weed plant on their property. This can be done orally or via a written arrangement.

By informing them of the potential danger that is imminent as a result of the presence of the weed plant, you are putting yourself in an advantageous position to claim against them if they fail to take proper steps to remedy the situation.

  • Community protection notice

For persons living in England or Wales, a community protection notice can be issued to a neighbour that has a weed plant on the land that is threatening to encroach on the adjacent lands.

The notice serves the purpose of notifying a person to take reasonable measures to act on a certain problem that may end up affecting other people with regard to their property.

To get this notice from the concerned authorities, it is required that you show proof that you had relayed to your neighbour the existence of the weed plant and they failed to take reasonable action.

  • Court action

There are cases where neighbours have been sued by their adjacent neighbours for letting Japanese knotweed encroach on their property.

The case of Smith v Line speaks to this issue in detail and has been used as a precedent in most legal suits involving Japanese knotweed disputes where encroachment has been occasioned by the neighbour.

In essence, if you notice the presence of the weed plant on your property and you refuse to treat it, then you can be sued by your neighbours either for compensation to enable them to treat the weed plant themselves or for the court to compel you to initiate the treatment program yourself to avoid further damage.

Another reason that will force one to consider a court action claim is that the encroachment of the weed plant on their property causes the value of the property to fall significantly hence the affected neighbour can make a court claim to ensure that the value of the property does not depreciate further since you will be forced to clear the invasive weed plant.

Knotweed on a property and invading a neighbour's property too
Knotweed on a property and invading a neighbour’s property too
  • Alternative means of dispute resolution

At times, it may be difficult to ascertain the origin of Japanese knotweed, especially where there are shared areas such as the garden, play areas for children, and parking or relaxation facilities as such making it difficult to blame one neighbour for the encroachment.

At times, the neighbour having the weed plant present on their property may not be in a position to treat the plant owing to their financial position thus requiring a consented effort to get rid of the weed plant.

In such a scenario, it is advised not to maintain a hard line as regards the person to take full responsibility and instead come up with alternative measures on how to collectively solve the problem.

The principle of being a ‘good neighbour’ should come into play when it is evident that one person cannot take the full burden.

There are various ways to get rid of Japanese knotweed from your property. Removal DIY methods are those that you can do by yourself that are not costly in your pockets. Some of them include cutting down the weed plant, uprooting, mowing, burning and burying.

Once you have taken notice of the encroachment of the weed plant from your neighbour, apart from making them aware of the weed plant, you can also take it upon yourself to try and eradicate the weed from your side of the property. 

What if the Japanese knotweed is growing on public land?

In instances where the property adjacent to yours is publicly owned and there is a potential knotweed infestation on your property, you need to engage with the public body having title to such land to treat the knotweed infestation.

If this does not happen, you are at liberty to make a formal claim through a court for compensation for any damage occasioned to you.

Public bodies are not exempted from treating the knotweed infestations in the lands that they own, they are held to an equal standard as private personnel/property owners. 

If your neighbour has Japanese knotweed infestation then that can impact your property's value
If your neighbour has a Japanese knotweed infestation then that can impact your property’s value


Although it is not illegal to have Japanese knotweed on your property, you have a duty of care of ensuring that the weed plant does not spread to neighbouring properties. The plants growing on your property must be kept in check and this includes the Japanese knotweed.

This means that in instances where the weed plant originates from your neighbour’s property, they are bestowed with the obligation of eliminating it once it has encroached on the property.

Finally, it is important to identify whether the neighbour is a private person or a public body so that you can know the right procedure to follow in demanding various remedies.

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Want to know more about what to do if a neighbour has Japanese Knotweed?

Knotweed Removal aims to provide the most up-to-date information, help and advice for YOU to make informed decisions. If you are unsure or uncertain about how to proceed, please reach out to us and we will gladly come back and advise you as best we can.

Governmental advice can be found here and the UK law covering the removal of Japanese Knotweed as stated under the Wildlife and Countryside Act 1981 can be found here.

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Do not forget we have a library of blogs covering many areas relevant to Japanese Knotweed, our free downloadable How-to Guides and Product Reviews on the latest methods being employed to eradicate or remove Japanese Knotweed.

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