Control Methods
All our Japanese Knotweed treatment methods are endorsed by the Environment Agency Codes of Practice and the industry trade body – The Property Care Association which can be tailored to suit you as the client. We are happy to consider a staggered payment schedule for any work that does not involve a 3rd party, who may require evidence of pre-payment in full from the outset (mortgage lenders as an example).
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Bund / Stockpiling
Creating a bund or stockpiling is essentially a combined treatment method of stem-injection or foliar application, followed by excavating the underground material and removing the soil and material to a different section of the site, where the emergence of ‘new shoots’ can be subjected to further herbicide application. Done correctly, control is achieved far quicker than conventional herbicide application, therefore ‘saving’ the landowner several years. This method is particularly useful on building plots / development sites as work can continue at the original infestation site.
Cell Burial / Root Barrier
Providing there is adequate space on site, creating a Cell Burial or utilising a Root Barrier will avert the substantial costs of transporting the soil and waste to landfill. Cell burial involves burying the Japanese Knotweed material to a minimum depth or if encapsulated within a geo-membrane, burial can commence closer to the surface. Root barriers can be installed both vertically (normally when there is a risk of cross-boundary contamination) and horizontally.
Excavation & Removal Off Site
Although Excavation & Removal of Japanese Knotweed material off site, is a legitimate and swift control option and has its advantages for development sites (done correctly!), we are not advocates of pursuing this method as this raises significant logistical challenges. A high risk of spreading, the cost implication in conveying the material to designated landfill and amongst other issues, there are also considerable duty of care requirements under the Environmental Protection Act (EPA) 1990. We are however, happy to act in a consultancy role as clerk of the works providing certain conditions are met with the landowner / developer.