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Japanese Knotweed Eradication

We offer Japanese Knotweed removal and eradication services across the UK

There are a number of control options for the removal / eradication of Japanese Knotweed, these are:


1. No treatment
In most cases doing nothing is not a viable option.

2. Herbicide treatment
The more economical option is to treat the JKW with herbicide to affect control.  The proximity of desirable trees and more importantly any watercourse affect the choice of permissible herbicides.  There are three options with regard to the means of treatment. 

  • The first of which is to apply the herbicide to the leaf of the plant in order that it can translocate through the plant and into the rhizome system.  This method is best performed in the late summer and autumn, the reason for this being that the natural senescence of the plant aids the movement of the herbicide into the rhizome.  Additionally the leaf area is significantly greater at this time of year and as such provides a greater opportunity to absorb the chemical.
  • Stem injection is another means of getting herbicide into the plant.  This involves cutting the stem above a node and then injecting concentrated product into the hollow inter-nodal cavity through the cuticle.  This method can be carried out once the stem has reached a suitable size.
  • Stem cutting, then filling the resultant cavity with a herbicide solution. The cut canes need to be stored on site, allowed to dry and then burnt.


3. Excavation and removal off-site
The quickest option is to dig out the soil and all of the rhizomes and dispose of them to a landfill site that is licensed to accept this waste. 
Whilst it is the swiftest method of removal it is almost the most costly, and is usually only an option for developers.

4. Excavation and burial on site
The excavated material can also legally be buried on site so long as there is at least a five-metre depth of fill covering the contaminated material. Alternatively, if only 2 metre in-fill is possible then the excavated material may be buried on site within a membrane cell.
It is desirable to avoid burying under the footprint of an intended building.
Environmental Agency guidelines recommend that the position of such a cell is recorded on the deeds of the property

5. Excavation and stockpiling for future treatment
If there is sufficient space on the site, then all the contaminated soil could first be excavated and dumped onto a suitable area of the site where it can remain undisturbed. The soil bund should be spread as thinly as possible to allow the JKW to grow and then future growth treated with herbicide as above.
As no development is planned for the area around and occupied by the Japanese Knotweed we recommend Herbicide application as the most cost effective solution for control.

As the area around and occupied by the Japanese Knotweed is part of the planned development / extension the only choice is to excavate the area of contamination. The costs will be mitigated, by minimising the amount of soil required to be excavated and removed to landfill, this will be done by tracking the rhizome through the soil

Japanese Knotweed rhizome is unlikely to extend below the house foundations and, as there are no plans to undertake any construction work, these options are unnecessary.

See:
An introduction to Japanese Knotweed 
Japanese Knotweed Identification
Japanese Knotweed Eradication

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