Japanese Knotweed FAQs

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Japanese Knotweed FAQs


How did Japanese Knotweed get into the country?

In the 19th Century, the Victorians brought the plant into the county because they liked the look of the plant. They did not, however, know what a mistake that would be for the future.

Knotweed looks quite similar to other plants, how do I know that I have got Knotweed on my property?

The quickest way would be to email a photo to us at and we will email you back with the answer. No charge. You can also use our guide to help identify Japanese Knotweed or call us and our team will be happy to advise you over the phone.

Firstly don’t panic. Are you sure that it is Japanese Knotweed? You can use our guide to help identify Japanese Knotweed or call us to discuss your requirements, our team will be happy to advise you over the phone. if you would prefer to complete our online form then you can find it here.

What are the regulations and laws regarding Japanese Knotweed?

The laws and legislation regarding Japanese Knotweed differ depending on which part of the UK you are in. The Wildlife and Countryside Act 1981 refers to England, Wales and Northern Ireland whereas Scotland is covered under the Wildlife and Natural Environment (Scotland) Act 2011.

Although it is not against the law to have Japanese Knotweed on your land, the law states that it is an offence to cause it to spread. Due to the destructive nature of the invasive weed, if Japanese Knotweed spreads encroaches onto your neighbour’s land you can face a conviction, a fine of up to £5,000 and/or six months in prison.

In relation to the disposal of Japanese Knotweed, legislation states that Japanese Knotweed is classed as controlled waste and if not disposed of correctly may lead to prosecution under section 34 of the Environmental Protection Act (EPA) 1990. It must be taken to a licensed landfill site and if you are transporting Japanese Knotweed waste you need a Waste Carrier’s license. Failure to show the license can result in a Fixed Penalty Notice of £300.

What if Japanese Knotweed encroaches onto your land?

You should consult with your neighbour about how they plan to deal with the Japanese Knotweed issue. Without causing a dispute, highlight why Japanese Knotweed is a problem. Your neighbour may not be aware of the issue and from our experience, it is very common to find that most people do not know what Japanese Knotweed is.

How long will Japanese Knotweed treatment take?

Nimrod treatment programs vary depending on whether we advise that spray treatment is the best course or another method such as excavation or soil sifting. Depending on the size of the area, a spray treatment can take just minutes but the type of chemical we use will differ depending on the surrounding environment. Nimrod will then recommend a 1 year (Included in the treatment price), 5 year or 10 year management plan to ensure eradication. Using an excavation method, again depending on size of the area, can take up to several days. The management plan/ insurance backed warranty again will then ensure complete eradication. Contact us to discuss your requirements, our team will be happy to advise you.

Here is a few tips about what not to do if you find Japanese Knotweed on your premises

  • DO NOT try to dig up Japanese Knotweed as this will lead to a significant increase in stem density. Even a tiny fragment of the cut rhizome (root) is capable of regeneration.
  • DO NOT cut the stems without treating the roots. Cutting the stems encourage the roots to take on more nutrients that enhances the growth of the root system considerably.
  • DO NOT spread soil contaminated with Japanese Knotweed rhizome. Any soil that is obtained from ground within 7m of a Japanese Knotweed plant could contain rhizome. The rhizome is highly regenerative and will readily grow into new plants.
  • DO NOT remove it from the site unless taking it to an approved land fill site that will accept it and you have a valid Waste Carriers Licence.