The Eraginate® treatment process involves cutting down the Japanese Knotweed (JKW) plant material, excavation of the rhizomes in the soil matrix, screening and hand picking the larger rhizomes and then disposal at a suitably licensed facility. We then use approved chemicals to treat any remaining Japanese Knotweed on site.

The remaining soils are available for re-use on site as backfill material or in garden/landscaped areas (subject to a minimum of 400mm clean cap cover). We’ve designed this process to reduce the quantity of soil that’s sent to landfill.

Key Advantages

Current Japanese Knotweed treatment methods include Dig & Dump, Dig & Bury and Stem Injection. These treatments are effective, yet they each have their own disadvantages:

Dig & Dump: Expensive landfill disposal costs.

Dig & Bury: Restricted use available on land with the JKW still being on site.

Stem Injection: Treatments can take up to 3 years.

Our Eraginate® process takes all of these disadvantages away by eliminating the need to dispose of large amounts of contaminated soil. It also changes the timescale of 2-3 years to 2-3 weeks, and removes all of the JKW off-site, leaving no chance of re-growth.

Treatment Capability

Eraginate® treatment has proven to be effective on any size of Japanese Knotweed infestation. It shines the most on time-sensitive sites where development is pending or a deadline needs to be met. We developed this process in house, so our team are fully skilled in delivering the results required. Check out our Projects section for some case studies or contact us if you’d like a free survey!


Drone image of a site in Wicklow where Eraginate was performed, showing mounds of clean soil and a digger