A hybrid method combining physical excavation and herbicide treatment

Stockpile & Treat is a cost effective method for large development sites where knotweed infested soils are present in construction critical areas, and where space allows for temporary stockpiling. 

The method involves the physical excavation either by us or under our expert supervision of all infested soils that contain viable rhizome from construction critical areas (e.g. areas likely to be disturbed by the construction process).

These soils are then stockpiled in a non-critical area on site, preferably no higher than 500mm thick. Knotweed growth in the stockpile is actively encouraged, ready for subsequent herbicide treatment over a full growing season.

Procedures are put in place to ensure that the knotweed infested soil is not allowed to spread to otherwise clean areas of the site by careful management of the haulage route.

This method can prove very cost effective, but is often not an option due to lack of space for the stockpile. The thickness of the stockpile can be increased to reduce the space requirement, but this will extend the treatment period using herbicides to more than one growing season.

So it may be that other methods, such as Xtract^TM, are better suited. 

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