Japanese Knotweed Treatment

Depending on the extent of the contamination, the appropriate Japanese Knotweed treatment plan and control methods can vary. This treatment guide shall outline our most common Japanese Knotweed control and eradication techniques. Our team has over 15 years experience and know how to get rid of Japanese Knotweed. Visit our costs page for a full list of removal costs and pricing plans.

Japanese Knotweed Control & Eradication

Below are the our four methods of Japanese Knotweed treatment, control, and disposal. Each technique follows the Knotweed code of practice outlined by the PCA and the Environment Agency. By using our company, you can be sure we follow up-to-date legislation for the handling of the invasive plant.

  1. Herbicide application programme (HAP) – applying herbicides to the leaves, or injecting into stems over several years.
  2. Excavation and moved to landfill – quickest method, but can be expensive.
  3. Relocation and excavation on site which is followed by HAP.
  4. Excavation and burying on site, or sealing with a specialist root barrier.

Herbicide Application Program (HAP)

Japanese Knotweed Treatment

The herbicide application program involves treating Japanese Knotweed on site with a selection of appropriate herbicides at regular intervals over the next 3 growing cycles. However, in most cases you will see signs of deterioration after the first application in year one.

The overall time taken for Knotweed control depends on the time of the year the first application of herbicide. Our 3 year treatment program comes with a 2 year guarantee. Whilst our 5 year program guarantee can be extended by 5 or 10 years, with 1 monitoring visit in each of the guarantee years.

Control with herbicide is the favoured Japanese Knotweed treatment by the Environment Agency. This is because it avoids the nuisance and removal costs of excavating, transporting contaminated waste and transferring the problem to Knotweed Licensed landfill sites.

A range of appropriate herbicides will be either sprayed onto, or injected into the plant’s system. The herbicide will be absorbed by the weed and penetrate the roots, or rhizome system. This is a key area in Japanese Knotweed treatment for effective eradication and control. Treatment near water may require a permit from the Environment Agency.

During the HAP treatment program, new shoots will appear as the plants try to fight against the herbicide. This is natural and allows us to apply more herbicide to the rhizome root system and gradually weaken the plants ability to regenerate.

How to Get Rid of Japanese Knotweed

Getting Rid Of Japanese Knotweed

Getting rid of Japanese Knotweed yourself by cutting the plant will not eradicate it. We strongly advise not to attempt to get rid of the highly aggressive weed yourself. In most cases it will cause the growth and spread of the plant to become even worse. That is why our qualified and experienced team are here to help. Eventually, the correct application of herbicide over a sustained period will exhaust the rhizome root system and reduce the plant’s ability to regenerate.

Following the guide below, alongside our professional Japanese Knotweed treatment, you will start seeing the benefits of our treatment programs.

Do not:

  • Cut or trim green, or treated weeds.
  • Treat the weeds yourself with herbicide.
  • Disturb the ground within 2-3 m of any plant.
  • Dispose of any plant material, including soil, from within a 5 m radius of previously contaminated area off site.
  • Allow access or traffic across the area of contamination.


  • Leave the weed alone and allow our herbicide to work.
  • Cut down the dead canes between January and February. Allow them to dry out on site.
  • Quarantine the area of contamination to prevent traffic spreading the plant material across your property.


Japanese Knotweed eradication

If you need fast eradication of the Japanese Knotweed from the site in question.

The excavation process for Japanese Knotweed treatment is for the plants and surrounding contaminated soil. This involves tracking and excavating the root system that may extend several metres from the visible edge of the contamination and possibly down to a depth of 2+ metres.

We can reduce the amount of material that has to be removed if the excavation and rhizome tracking is closely supervised to reduce the soil excavated. All rhizomes must be tracked, followed and removed to stop any regrowth appearing.

Move to Landfill

The soil and plant debris, which is classified as contaminated waste, must then be transported to a licensed site using registered contaminated waste haulage contractors. Subsequently, you may incur extra cost purchasing and transporting soil to the site to backfill the excavated area. It is important to point out that ground that has been contaminated with Japanese Knotweed remains classified as contaminated waste. Therefore, this also has to be handled and accepted by suitable registered waste carriers and disposed of at specialist licensed landfill sites. Consequently, additional charges may incur due to landfill tax charges.

As the nation is running short of landfill, the Government wants to discourage Japanese Knotweed being put into landfill and has levied a tax of £85 per ton for plant waste. This will also be on top of the cost of haulage and excavation.

We can be on site to supervise the excavation of the plant, rhizome root system and contaminated soil using the appropriate qualified manpower and equipment supplied by the client. We will ensure that all procedures are followed in line with the Environment Agency Code of Practice for the Control of Japanese Knotweed.

Japanese Knotweeed Relocation on Site and Treatment with HAP

This Japanese Knotweed treatment involves excavating and relocating plant material and contaminated soil is on the current site. The area is then quarantined and fenced off to prevent casual foot traffic. Subsequently the quarantined area is then treated with an appropriate HAP without the cost of transporting and landfill fees. We can carry this work out, or supervise the client’s resources in carrying it out.

Protective Root Barrier

In certain circumstances where there is contamination on an adjacent site, it may also be necessary to dig down and install a specialist Japanese Knotweed rhizome root barrier. The area protected by the barrier would then be treated with regular monitoring and a HAP. This will continue until the contamination on the adjacent site has eventually been brought under control.

We can supply you with a completion and guarantee certificates once the program has been carried out in full, or if the program cost and guarantee has been paid in advance.

Taylor Total Weed Control Ltd carries significant public and product liability insurance. Copies of which can be forwarded to you.

Taylor Total Weed Control Ltd is registered with the Environment Agency under the carriage of waste regulations 2011 registration number CB/UM3984NA. Copies of which can be forwarded.

If you have any questions or concerns please do not hesitate to send any questions to info@japaneseknotweedremoval.co.uk or call us on 02920 397554 or 0800 111 4958.