Japanese Knotweed has become an increasing problem throughout the UK. Invasive and difficult to get rid of, if your property or home becomes infested with this plant it can quickly cause damage to your infrastructure and leave you with a hefty bill to put right.

We are experts at Japanese Knotweed removal, a company with a proven track record over 20 years, working on commercial as well as domestic properties.

The reason that this damaging plant causes so much alarm is that it can begin growing again from just a fragment of its root structure or rhizome. These roots are able to grow down as deep as nine feet which means getting rid of any infestation is never just a simple matter of digging it up.

We use tried and tested methods of Japanese Knotweed removal. After assessing the problem, we’ll be able to recommend the removal solution that is best suited to your property. We’re open and transparent about our billing, which means you won’t experience any hidden costs or surprises further down the line.

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Excavator removing knotweed

Herbicide treatment of Japanese knotweed

Resi-Dig-Out in Garden


  Environet's Japanese knotweed eradication has proved to be highly effective on our development sites. Thank you for your excellent service, fast response and professional consultancy support. 

Nigel Tompsett, Commercial Director - Berkeley Group PLC

How we get rid of Japanese knotweed

There a several options when it comes to effective Japanese Knotweed removal, all of which come with our 5-10 year guarantee, which is insurance-backed by a syndicate at Lloyds.


Physical Removal

Digging up the Japanese Knotweed is one method. This depends on the scope of the damage and access we have to the area. The methods we use are:

  • Xtract™ - Removing your Japanese Knotweed in a matter of days, particularly focusing on getting rid of rhizomes.
  • Resi-Dig-Out™ - A method specially designed for domestic properties.
  • Dig and Dump – Physically removing the Japanese Knotweed and taking it to specialist disposal sites.

Chemical Treatment

Using pesticides to remove Japanese Knotweed is another option and one which suits many domestic properties, including those where deep excavation is not an option. The processes we use include:

  • DART™ - a less intrusive and efficient way of disposing of Japanese Knotweed.
  • Herbicide Treatment – there are a range of different options depending on your situation.

Combination Removal

Resolving the problem of Japanese Knotweed removal often involves a combination of both physical and chemical removal. This can include:

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Which removal method should I choose?

Before we can decide which Japanese Knotweed removal method works best for your property, it’s important to carry out a full survey and determine the extent of the problem.

Our process normally follows a standard format:


Identify Japanese Knotweed

This can be simple to do if you send us an image of the suspected infestation. Japanese Knotweed is pretty distinctive and we’ll quickly be able to tell you if there is a problem.

Your Solution

The next step is to assess the extent of the problem and recommend an appropriate solution that is tailored to your specific needs. This can most effectively be done by organising a survey of the property to look for any visible presence of Japanese knotweed.

Once we’ve agreed the solution, we’ll provide you with a full, easy to understand quote for what the work will cost and how long it should take. There are never any hidden or ‘extra charges’ in our quote.

Treatment and Removal

When the quote is agreed, our experienced team will get to work. We follow industry best practice, including where appropriate the PCA and INNSA Codes of Practice which means you’ll have a high degree of confidence the infestation has been removed.

Our Guarantee

Our guarantees are insurance-backed by a syndicate at Lloyd’s of London providing up to 10 years’ peace of mind, with liability limited at up to £100,000 as standard, higher limits can be negotiated with our insurers.



Start fixing your Japanese knotweed problem today,

call our team for specialist advice and effective solutions.

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Frequently Asked Questions

There is no such thing as a one size fits all. The best method for your site will depend upon your timeframes, site constraints, overall objective and budget. We have various Japanese knotweed removal methods available, and our team of experts will be able to recommend the most appropriate option for your circumstances. In most circumstances, especially on development sites and in most gardens, complete knotweed removal should be the objective. Where this is an unattainable goal e.g. knotweed along a watercourse originating from knotweed upstream, a control programme may be a more realistic option.
Whether you're clearing a site for development, trying to buy or sell a property or just keen to rid your garden of Japanese knotweed, choosing the right contractor for the job is an important first step.

Here are our top 10 tips.

1. Use a real specialist There are plenty of general groundsmen, landscape gardeners and weed controllers who also tackle Japanese knotweed, but there is no plant that behaves quite like Japanese knotweed, and it deserves a great deal of understanding and professional expertise. If they can't answer all your questions about Japanese knotweed, then steer clear.
2. Check technical expertise A dedicated specialist will be able to demonstrate a high level of technical expertise in the eradication and control options available to deal with your knotweed problem. Lots of people talk about controlling it: fewer promise to eradicate it. Make sure you ask them to cover the pros and cons of all available treatment options with you. They should either do this on the phone or at a site consultation visit.
3. Do some background financial checks A company that’s been in business for a long time is probably doing a good job and is financially stable. As any herbicide programme should have a detailed post treatment management plan and a guarantee, you will want to know they’ll still be around to follow up next season to deal with any minor regrowth.
4. Check out credentials and reputation If you can, make time to follow up references and seek referrals. A good contractor will happily share this information with you. Some contractors will have accreditations, but at the end of the day, it’s their extensive hands-on experience and high volumes of successfully completed jobs that really counts.
5. Request a written estimate Any contractor who does not provide you with a written estimate should be crossed off your list immediately.
6. Compare estimates If you decide to get more than one estimate, compare them carefully. Remember the lowest bidder is not always the best.
7. Know what's involved A reputable specialist won’t start work without your written instruction to do so. The paperwork should clearly spell out all the steps the contractor will take from beginning to end of your job, what treatment methods are included, the payment schedule and the time line for the project.
8. Make sure the work is guaranteed with an insurance backed guarantee (IBG) Guarantees typically range from 5 to 10 years and you need to be assured that these are worth the paper they are written on (see 3 above). Read the small print and know where the liabilities lie. Be aware that a lot of knotweed companies will downplay this element or offer alternatives without the same level of financial security. Also consider the security of the insurer where an IBG is provided. We are one of very few companies in the UK providing an IBG backed by an "A" rated insurer at Lloyd's.
9. "Consider the lilies!" If you are concerned about the environmental impact of the removal method, killing other plants etc - question the environmental credentials of the contractor. Understanding the wider impacts of dealing with this invasive species is all part of the job for a true expert.
10. Choose to work with someone you like and trust After all, it’s your property they’ll be working on and you want them to leave the site clean and tidy afterwards. You need to be reassured that they’ll continue to monitor the site after the initial treatment and will deal swiftly with any regrowth should it occur. If you don't choose the right contractor, you could end up disappointed in the work, feeling swindled and needing someone else to finish the job properly when the knotweed pokes its new shoots up again next year.
Cutting the knotweed stems down and pouring household chemicals such as bleach, diesel, salt or even weed killer will not ultimately kill knotweed, even if all the above ground growth has gone. Firstly, by cutting the plants down, you are stopping the internal workings of the plant, meaning water and nutrients will not be circulating around the plant – and nor will the chemicals you have applied! DIY treatments often shock the knotweed into a state of dormancy – giving you the impression it is dead, but once ground conditions have improved again, or the ground is disturbed, more often than not, the knotweed will grow straight back.

DIY treatment can also make it harder for knotweed removal experts to deal with an infestation, as it limits the options available. The other downside to DIY attempts is that they will not be supported by an insurance backed guarantee, so if you try to sell or remortgage the property, banks and building societies will be unlikely to lend.
One of the first questions many of our clients ask is ‘Are you a member of the PCA?’

Many news articles in the media state that mortgage lenders will only accept work completed by a PCA member. This is not the case, as there are many reputable and capable companies who are not members of the PCA but do offer insurance backed guarantees.

Environet is a PCA member, and we have the added benefit of our guarantees being underwritten at Lloyd’s, an A-rated insurer.

Treatment & Removal on residential properties

We discuss the options for treatment and removal of Japanese knotweed on residential properties

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