On site burial of Japanese knotweed

On site burial involves the physical excavation of infested soils, which are then stockpiled on site. A burial pit is then created (typically 5m+ deep), with the clean material stockpiled elsewhere on site. The burial pit is then lined with a proprietary root barrier on the bottom and sides, with all joints welded together. The stockpile containing the infested soils is then backfilled into the burial pit. A root barrier is then laid over the surface of the infested soils and welded to the sides to form a complete containment cell. Material from the clean stockpile is then laid over the containment cell with a minimum of 2m cover. The remaining clean material is used to backfill the previously infested area.

This method involves considerable earthworks and relies solely on the integrity of the root barriers to contain the knotweed from spreading. It should be considered as a knotweed control method, not an eradication method. For these reasons, we believe the Xtract™ method is a considerably better method, rendering on site burial obsolete.

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"a control method using containment root barriers and involving substantial earthworks. Better eradication methods, such as Xtract are available."