Japanese Knotweed

Japanese Knotweed Removal

Knighton Countryside offers a full range of services for the removal of Japanese Knotweed. and we have carried out control measures for railway, construction and utility companies. Our demonstrable capability to eradicate knotweed on a commercial scale complements our work for domestic clients.

Japanese Knotweed needs to be handled in a responsible manner to protect the environment and prevent property risk, and works conducted to control or eradicate this invasive weed should be completed in accordance to the ‘The Knotweed Code of Practice 2013’, published by the Environment Agency.

The spread of Japanese Knotweed is governed under the Wildlife and Countryside Act 1981 but in summary, although it is an offence to cause it to grow, and it must be disposed of under license, property owners are not required to eradicate it.

Knighton Countryside can offer the following:

An appropriately qualified and/or experienced person will carry out a detailed inspection and assessment of the property and provide a ‘management plan’ including the following features:

•    a description of the property with an accurate record of the Japanese Knotweed infestation including dimensions and supporting photographs
•    a description of the methods to be used to eradicate Japanese Knotweed.
•    a treatment schedule that is updated as treatments are carried out.
•    a completion certificate that confirms the treatment is complete and that the Japanese Knotweed at the property has been remediated.

Methods for the control of Japanese Knotweed vary and Knighton can carry out any combination of the following:

Removal of the plant mechanically requires all waste to be disposed of in a controlled manner, as even the smallest rhizome can regenerate into a new plant. The plant and comtaminated soil can also be transferred to a controlled area of the site so that it can be effectively treated for regrowth rather than being disposed of in landfill

Spraying with Glyphosate
This should be done in the early stages of growth, and the regrowth treated at regular intervals. A spraying programme is likely to last for three years, and an ongoing watching brief should follow.

On site burial
The knotweed, together with any contaminated soil, can be buried on a suitable area of a site within a heat sealed plastic membrane. This has to be done with the approval of the Environment Agency.

Stem Injection
Where a sprayed application of herbicide is difficult, then plants can be individually injected with glyphosate. This is an excellent method when working near water or in ecologically sensitive areas.

Root Barriers
The roots of Japanese knotweed do not grow much deeper than two metres. It is therefore possible to create a ‘bund’ with an impenetrable root barrier which then contains the Knotweed in a designated area, allowing for ongoing herbicide treatment.

Japanese Knotweed and Property
In the United Kingdom, Japanese Knotweed has received a lot of attention in the press as a result of very restrictive lending policies by banks and other mortgage companies. The Royal Institute of Chartered Surveyors published a report in 2012 in which they state that:

‘There is a real lack of information and understanding of what Japanese Knotweed is and the damage it can cause. Without actual advice and guidance, surveyors have been unsure of how to assess the risk of Japanese Knotweed, which can result in inconsistent reporting of the plant in mortgage valuations.’
Philip Santo, RICS Residential Professional Group

The report categorises Knotweed at four levels of risk. The full report can be found here, and makes useful reading.

If you are looking for large scale commercial solutions for Knotweed eradication, or for help with Knotweed on private property, then please don’t hesitate to get in touch to talk it through.