Our solutions - our armoury in the fight against Japanese knotweed
The method best suited to your particular situation will depend on your site, how you intend to develop it and when. Please see the links to the left for further information on each method.
Is the affected area likely to be disturbed by the proposed construction works?
If YES you need a physical removal method.
Do not build on land you know contains knotweed rhizome, whether herbicide treated or not.
Physical Removal Methods
Xtract™ - for rapid and complete eradication of Japanese knotweed
On site remediation using Environet’s unique purpose designed machinery to remove Japanese knotweed from infested soil on construction and development sites. Xtract™ is our most effective weapon, literally removing the root of the problem. Read more...
This solution involves moving infested soil from construction critical areas to other non-critical areas on site for subsequent herbicide treatment. A low cost solution where space for stockpiling permits. Read more ...
Cell burial – containment not eradication
Excavation and removal of all knotweed infested soil to licensed landfill. The Environment Agency’s option of last resort, but suited where other methods are impractical. Read more ...
On site burial, contained within a geo-textile root barrier, and covered with clean topsoil. Not a solution we favour – better alternatives exist! Don't bother to read more!
In-situ Treatment Methods
If the affected area is to remain undisturbed, then in-situ herbicide treatment will be the most cost effective and least disruptive method.
Herbicide treatment foliar spray
Several applications of carefully selected herbicides sprayed onto Japanese knotweed between May and October – a low cost alternative where infested soils are not likely to be disturbed. Read more ...
Herbicide using stem injection
Direct injection of herbicide into the stems of Japanese knotweed applied from June to October – more targeted than foliar spray so used in situations where collateral damage to non-target plants must be avoided at all costs. Some doubts remain about efficacy. Read more ...
Preventing encroachment across boundaries
Used to contain spread of Japanese knotweed in both horizontal and vertical directions to protect against encroachment to or from adjoining land and to protect designated structures. Read more ...
Expert witness services carried out in accordance Civil Procedure Rules (CPR 35) for disputes relating to Japanese knotweed. Read more ...
Guarantees against growth of Japanese knotweed for up to 20 years. Read more ...
Other invasive plants
Control and eradication of other invasive plant species such as Giant hogweed. Read more ...