We developed the Eraginate® treatment process as an alternative to the popular Dig & Dump and Stem Injection techniques. Eraginate® is not only quick but cost efficient as well.

The treatment process involves:

  • Cutting down the Japanese Knotweed plant material
  • Excavating the rhizomes (roots) in the soil matrix
  • Soil screening and hand-picking the larger rhizomes for disposal at a suitably licensed facility
  • Using approved chemicals to treat the remaining Japanese Knotweed material in the soils

Once treatments are completed, the remaining soils can be re-used on site as back-fill material or in gardens and landscaped areas, subject to a minimum of 400mm clean cap cover.

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 3 or more years.

Our Eraginate® process takes all of these disadvantages away. We designed this process to minimise the amount of soil that’s sent to landfill, and so reduce costs. The process also reduces the amount of time it takes to fully eradicate a Japanese Knotweed infestation, with most treatments taking just weeks to complete. Finally, all of the JKW is removed from the site, meaning there is no chance of re-growth.

Treatment Capability

Our 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. And as we developed this process in-house, our team are fully skilled in delivering the results required.

Check out our Projects section for some case studies or contact us to take advantage of our free site survey.


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