Japanese knotweed is an non-native invasive plant species that can spread rapidly and penetrate buildings, as pictured right, and through road surfaces.
Japanese knotweed tolerates a wide range of soil conditions and can regenerate from very small amounts of plant material.
As little as 0.7 gram of root (rhizome) can produce a new plant with a root system that can spread up to 7 metres and up to 3 metres in depth.
Transportation of material downstream within river systems and movement of soil contaminated by plant , especially when fly-tipped in hedgerows, are major ways in which new sites are established.
Even when chemically treated and apparently killed off, the rhizome can lay dormant for years only to resurface at a later date.
Harley Wilson Associates have a proven track record in identifying, managing, and implementing controls to check the spread of Japanese Knotweed.
We are able to offer specialist advice where Japanese Knotweed is present on development sites.
Harley Wilson Associates can provide flexible and impartial advice regarding the various types of design solutions incorporating Japanese Knotweed barriers into new buildings.
We also have extensive experience in the installation of barriers involving a wide range of site conditions and construction types.
We can offer on-site toolbox talks and installation specifications, and site monitoring if required.
