TEL: 01327 703129
(Head Office)

TEL : 01962 886060
(Southern Regional Office)


Treatment Services

Control and Eradication

Early stage before eradication

There are a number of methods available for remediating Japanese knotweed. Many companies refer to all of them as achieving eradication, which is inaccurate, since most are a means of achieving control. It is important to understand the distinction, as there may be long-term considerations involved where control methods have been used.


Herbicide Treatment

Spraying with a herbicide

Herbicide programmes take several years to achieve completion, but are often the cheapest and most environmentally-friendly solution for most situations. Unless the knotweed is extremely immature and has not yet developed a rhizome system of any great significance, treatment will take a minimum of three years and will take longer if the knotweed is mature and well-established. Follow-up monitoring of at least two years after the final herbicide application will be required on all treatment programmes before a Certificate of Completion can be issued, in accordance with the PCA Code of Practice.



Excavation in progress

Total eradication of Japanese knotweed requires it to be removed from the ground to the fullest extent of the rhizome. Knotweed and soil containing knotweed material is classed as a controlled waste and, as such, consideration needs to be given to what to do with the knotweed once it has been excavated. It is the disposal, as well as plant machinery costs (knotweed rhizome in the ground can be extensive and will require mechanical excavators to remove), that means full excavation is the most expensive remediation option.


Combined and Alternative Methods

knotweed resistant root barrier

Full removal or an in-situ herbicide programme are not the only means of remediating Japanese knotweed. There are a number of other methodologies that include reduced digs, relocation, screening and the use of knotweed-resistant root barrier membranes, though all these methodologies will still involve some manner of excavation and/or herbicide control. Each has their own pros and cons and their suitability will be dependent on the specifics of the site.


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