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Japanese Knotweed Excavation Derbyshire

This week we’ve been in Derbyshire, supervising the excavation of Japanese knotweed.

This stand of Japanese knotweed was very developed and we have estimated that the plant was over 20 years old!

Usually for any excavation of Japanese knotweed we would dig to a depth of 3 metres. Fortunately for this site in Derbyshire, although large. It a sub base of clay just shy of 2 metres that the roots had not penetrated.  We were able to safely remove all of the rhizome of the Japanese knotweed.

We perform excavations on a regular basis, for commercial sites in particular. For clients who cannot afford the time to have the site lay dormant for over 3 years while the Japanese knotweed is treated with herbicides. Excavation saves you time as the entirety of the plant is dug up, removed and disposed of correctly, without any hassle.

We are a very commercially minded in this respect, we aim to really fulfil the requirements of our clients. This will save you time, money and get your development back on track for completion.

Contact us if you have any further questions regarding commercial excavation of Japanese knotweed.

Watch our video for this commercial excavation of Japanese knotweed in Derbyshire here. 


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We sat down with Mia from The Property Buying Company to discuss Japanese Knotweed and the impact it has had on their business.


We asked Mia, what does your company do? She advised We are property buying specialists, with many years’ experience within the property industry. We buy any property, in any condition, nationwide. We don’t offer the market value of the property, but we do offer a fair cash sum and all of the legals are included in this so the price we offer you is the price you will receive. We help to take the stress out of selling your property.”


We then asked Mia if she has ever encountered Japanese Knotweed before, and what their experience was. “We have on quite a few occasions, as it has become quite an extensive problem in England recently. We encountered a small family, living in a terraced house, where the Japanese Knotweed had grown under the patio and was starting to uproot it as it made its way towards the actual property” We went on to ask how their clients felt on the delivery of the news. “Our clients were, understandably, really worried about the problem. They didn’t really understand what it was or how to resolve the issue and they looked to us for advice as they really wanted to sell their property. It also concerned the neighbours who were attached to their property and it had started to spread onto their land.”


Keen to learn more about their experiences with Japanese Knotweed, we asked Mia how they deal with the issue when it arises, she advised us “We’ve worked with Japanese Knotweed specialists, nationwide, for years so we understand how damaging it can be to a property and how stressful it can be for the people living there. We know that treatment plans for Japanese Knotweed must be in place, particularly if a property is to be sold. Many auction houses and mortgage lenders are loathed to have anything to do with properties that have the weed on-site. Luckily, we’ve got the resources to deal with the weed and are confident that we can sell your property on because we will get rid of the problem and enable customers to break free and move on.”


With Japanese Knotweed becoming an ever-growing issue in the UK, we asked Mia if it had any impact on the way they do business. She said, “Luckily, we’ve been able to help a lot of customers living with Japanese Knotweed on their property. That’s why we’ve educated ourselves about what is involved in the removal process and made some great contacts in the industry that we can call on when we encounter a customer wanting to sell their property, but fearful that they won’t be able to. We can say, with confidence, that we will buy their property and sort out the problem, freeing them from having to deal with it themselves.”


Lastly, we asked Mia what advice they offer to any of their clients who discovers Japanese Knotweed, to which she answered “Try not to worry. Japanese Knotweed can affect any property, in any part of the country and we have specialist knowledge and teams who can help you to sell your property, despite the problem.”


If you have any concerns regarding Japanese Knotweed, please contact us. 




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October is well underway, and as the cool weather sets in and the days creep every shorter, Japanese Knotweed us going through a seasonal change which should not be ignored.

As we enter the winter period, Japanese Knotweed will begin to die back, but do not be fooled. Japanese Knotweed will lay dormant underground through the winter, waiting to emerge stronger than ever in Spring.

So, what can you look out for at this time of year?

The leaves will soon start the drop from Japanese Knotweed, and the canes will begin to die. The canes will turn brown and will bear a distinctive dark orange centre. The canes are still hollow and will be brittle, and if left undisturbed will continue to stand throughout winter, occasionally still standing amongst new growth the following spring.

If you suspect that you have Japanese Knotweed and it is showing signs of death, do not be fooled. It will return. Contact us today on 0800 1337 444, where our team will be glad to assist. We also offer a free of charge photographic identification service, just email your suspicious weeds to

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Recreational gorge scramblers have been enlisted to get to the root of the Japanese Knotweed and Rhododendron on the side of Corrieshalloch Gorge.

Due to the growth of these invasive weeds, other species are struggling to grow and soon the Rhododendron will soon block out the sunlight for this beautiful view. The Japanese Knotweeds invasive roots are threatening the embankment and could cause this to become loose as the roots grow further afield.

Treatment has started on the invasive weeds as workers scramble into the gorge to spray and inject with herbicide to try and eradicate the species. By starting a treatment program, the other species growing in the gorge will have a better chance of survival. It isn’t just shrubs and perennials that will suffer if the weeds aren’t treated, wildlife such as squirrels, eagles, and ravens depend on the foliage in the gorge.

The National Trust has planned to spend £60 million over the next five years to deal with the problem.








All media rights Willcopestakemedia, via activities at Hamletmountaineering


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The internet is filled with masses of information regarding Japanese Knotweed, and some of it can be particularly frightening. We receive dozens of phone calls every day, and many people as us to debunk myths that they have read online. Here are some of the most common, and why they are incorrect.

“You kill Japanese Knotweed by cutting it down and pouring bleach into it”

There are many different versions of this one using various different substances, but the answer to them all is no. The only substance we know to kill Japanese Knotweed is a glyphosate based herbicide. Unfortunately, the herbicides which are available to the public are also not strong enough to do the job. The herbicide we use is 300x stronger than anything available for purchase by the public.

“You can not get a mortgage on a property if it has Japanese Knotweed” 

We receive many panicked telephone calls from people on both sides of the purchase who believe this to be true, but worry not, because we can help. We can provide a Site Survey and Management Plan, coupled with an insurance backed guarantee. If you have these documents in place from a PCA accredited company like ourselves, mortgage lenders will happily release the funds.

“Japanese Knotweed can break through concrete” 

There are many horror stories littered across the internet regarding Japanese Knotweed, often about it’s strength and the damage it is capable of doing. Japanese Knotweed cannot break through a solid piece of concrete. It will, however, seek out any cracks or weaknesses in any structure, and many properties will have small cracks or movements below ground caused by various things including subsidence and foundation settling. Like all plants, Japanese Knotweed seeks light when underground. It’s rapid growth means that a small piece could find it’s way through a crack, and then push it open as it grows. Japanese Knotweed is not a superhero, but should still be taken seriously.

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Last night our Director Jason Harker had the pleasure of spending some time with Rodger Burnett of Charles Lyndon discussing the impact of the Court of Appeals decision in the case of Williams & Waistell Vs Network Rail.

Rodger Burnett lead the claimants to victory against Network Rail, with Mr Waistell being awarded £15,000 after Japanese Knotweed encroached onto their homes.

Rodger Burnett said: “This is a great result for Mr Waistell and homeowners up and down the country.”

This is a landmark ruling which will now mean that landowners will be able to claim damages if Japanese Knotweed has encroached on their property from neighbouring land.

We look forward to seeing how the ruling affects future cases.

If you are concerned about Japanese Knotweed, please contact us.

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September is upon us, and changes are taking place everywhere we look. Japanese Knotweed is no exception.

The Victorians brought Japanese Knotweed into the country for ornamental purposes. In late summer Japanese Knotweed develops beautiful clusters of creamy white flowers – but don’t be deceived. Despite their beauty, they are a classic indicator of Japanese Knotweed.

The flowers provide a great source of nectar, so you can expect to see an influx of insects in the garden when Japanese Knotweed is in bloom.

If you suspect you have Japanese Knotweed in your garden, don’t disturb it. Take a photograph and email us on, or call us on 0800 1337 444 for advice on how to proceed.

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Don’t miss the opportunity to attend our CPD accredited course in Japanese Knotweed Identification! There are only a couple of spaces left for Friday 7th September, and they’re filling up quickly!

The course covers everything you need to know about Japanese Knotweed, including identification, treatment methods, reporting, and the legal implications of Japanese Knotweed.

The course lasts for two hours and costs just £40.00. This price includes refreshments, an information pack to take away to further consolidate your learning, and a certificate of completion from The CPD Certification Service.

If you are interested in securing your seat, then please contact us on 01782 479 444, or email

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CPD stands for Continuing Professional Development and is a requirement in most industries. Anyone who is a member of a professional body is likely to have CPD requirements laid out to them, and there is usually a mandatory number of hours to complete annually. CPD exists to help people manage and record their own development on an ongoing basis, allowing the individual to reflect and review what they have learnt.

Japanese Knotweed Expert is proud to be a member of the CPD Certification Service. They are the leading institution for CPD accreditation, operating a strict course approval process.CPD

As a result of our 20 years experience in the invasive weed industry, we are now offering a CPD course in which we educate you, the learner, on how to identify Japanese Knotweed. This course is immensely useful for a wide range of professionals, including but not limited to surveyors, solicitors, builders, architects and estate/letting agents.

Our first event is coming up on Friday 7th September, with two following events scheduled on Friday 5th October, and Friday 2nd November. The course costs just £40.00 which includes refreshments and a certificate of completion.

If you would like any further information regarding our CPD course or any other services, please contact us. 

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If you work in the property sector, then you are probably already aware of Japanese Knotweed and the complications it can cause for a development project.


An infestation of Japanese Knotweed can be an extremely costly issue if it isn’t dealt with quickly and effectively, so it is important to know how to identify Japanese Knotweed, and what you should do if you suspect you have it on your site.


Continuing with works on a site which you know contains Japanese Knotweed is nothing short of foolish. Japanese Knotweed can devalue property by up to 50%, meaning all your investment will be in vain. Additionally, mortgage lenders will not give funds for properties with Japanese Knotweed, so you may find yourself unable to sell the development prior to completion.IMG-20180608-WA0021_1528446732288


If you are developing with the intention of keeping the property in your portfolio then you may be setting yourself up for further repair costs in the future, as Japanese Knotweed will seek out any weaknesses in foundations and exploit them, potentially causing serious structural damage.


In addition to all of this, there are legal implications to having Japanese Knotweed on your site. In allowing the infestation to spread onto neighbouring properties, you are breaking the law. Neighbours are able to initiate legal proceedings against you, meaning you could be liable for claims running into thousands of pounds, and even prosecution in some extreme cases.


If you suspect you have Japanese Knotweed on your site the don’t take the risk, contact us today for further advice.