ExcavationOn and off site treatment
On large construction sites when work is in progress, the presence of Japanese Knotweed can cause costly delays to the building process. However, where possible, Japanese Knotweed can be relocated to a quarantined area of the site for treatment later, allowing work to progress as normal on the rest of the site. The Japanese Knotweed infestation can be treated with a chemical application at a later, more convenient time.
Japanese Knotweed and contaminated soil can also be buried on site inside a heat sealed plastic membrane. This is ideal where no construction work has begun and the site can be fully excavated to make a hole deep enough to contain the Japanese Knotweed.
The burial site must not be disturbed after excavation and the re-burial location should be clearly marked on all site plans. The Environment Agency will need to be advised that the burial of Japanese Knotweed is taking place and all plans must be approved by them. It is very important that every trace of Japanese Knotweed is removed as a piece the size of your finger nail has the potential to regrow.
Excavation and off-site removal
This is the last resort and most expensive method but sometimes is a necessity. Especially for those sites where time is a constraint or there is no area on site to manage the waste. All waste will be removed and taken to a licensed landfill site.