Is it sensible to build over previously infested land treated with herbicide?
Due to risk of dormancy, we strongly advise you not to do this – if you are to substantially disturb the ground then you ought to consider a removal method.
Related Articles
Can I use the infested area after treatment?
Herbicide applications alone can effectively work so the plant is unable to produce new growth (this is viewed as successful treatment) but are unlikely to remove 100% of the underground rhizome system. During and following treatment, the ground will ...
Why do some companies tell us we can’t disturb the ground after herbicide treatment?
It is never possible to verify with 100% confidence that all knotweed has been killed following in-situ herbicide treatment. Disturbing the ground not only fragments the rhizome system leading to spread but also often leads to regrowth where the ...
Why would I need an excavation discovery dig?
The size of the infestation of visible knotweed on the surface may not be representative of the extent of knotweed rhizome under the ground. As JKW spreads its highly regenerative underground rhizome system underground, it is important to understand ...
When are treatments carried out?
In season treatment – May - November Knotweed can only be treated between the end of May and the beginning of November as spraying outside of the growing season has no impact. Similarly, over spraying causes the plant to go into shock and can force ...
Will there be any disruption to the house/garden whilst the works are carried out?
Yes, the amount and duration of disruption depends on what method is adopted. We endeavor to keep the disruption to the minimum but inevitably some loss of enjoyment that the property and garden provides will be experienced. Are there any precautions ...