Cost of Treatment and Removal
The eradication of Japanese knotweed is neither easy nor cheap. The rhizomes (underground roots) can spread extensively and can regrow from tiny fragments, making complete removal a challenging task.
Professional treatment often involves the use of specialised herbicides over several years. Even then, there’s no guarantee of total eradication. Costs will depend on the size of the infestation and the method of treatment.
Excavation is another method of removal, it requires removing a large amount of soil, sometimes several metres deep, to ensure all parts of the plant are removed. This method is more costly but does allow for the site to be developed on straight after removal.