Japanese knotweed advice

Japanese Knotweed FAQ'S & Advice

The presence of Japanese knotweed can cause disruption to development projects and incur unbudgeted costs through treatment and site delays if not dealt with properly from the very start.

Whether you encounter knotweed on a major building project or as part of a maintenance scheme, please ensure you follow these basic guidelines:


  • Contact Japanese Knotweed Ltd so we can manage, control and remove the problem for you.
  • Isolate the Japanese knotweed by means of ‘7m rhizome spread fencing’ prior to the commencement of development works to prevent any disturbance of the plant by workers, vehicles or members of the public.
  • Draw up a Knotweed Management Plan - especially if a number of contractors are to be involved on the site and adhere to it throughout your project.
  • Commence treatment/removal of Japanese knotweed as soon as possible after discovering its presence. Treatment of Japanese knotweed on land banks is highly recommended as they will prove easier to either sell or develop than if the knotweed has been allowed to thrive for several years.
  • Adhere to recommendations in the Environment Agency Knotweed Code of Practice (2013 version 3), when managing and treating Japanese knotweed.


  • Where possible allow works to commence on a development site without first drawing up a Knotweed Management Plan (KMP).
  • Allow demolition contractors or ground workers to conduct a site scrape or demolition on a site until the site has been properly inspected for the presence of knotweed.
  • Allow knotweed material to intentionally or unintentionally leave your site in a manner that will contravene the Environmental Protection Act and the Environmental Protection (Duty of Care) Regulations. If Japanese knotweed material is to leave site it must do so via a registered waste carrier and must be disposed of by prior arrangement at a specially licensed landfill facility able to accept and dispose of Japanese knotweed.
  • Allow Japanese knotweed to spread into adjacent properties, as this will contravene The Wildlife and Countryside Act and leave you vulnerable to third party litigation from your neighbour(s).
  • Flail or strim knotweed, as this will cause the Japanese knotweed to spread.
  • Store materials on top of Japanese knotweed areas, or the materials themselves could become contaminated with knotweed and have to be disposed of accordingly.
  • Chip Japanese knotweed material, as mechanical chippers do not kill the plant and could result in new Japanese knotweed growth wherever the chipped material is spread.
  • Add Japanese knotweed to compost, as this can lead to knotweed growing in your compost heap.
  • Burn Japanese knotweed as a sole means of treatment as large rhizome and crowns can survive burning.


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