Introduction

The use of thermo-electric eradication technology has shown significant promise in the management of invasive plant species such as Japanese Knotweed. In 2025, the Japanese Knotweed Agency, in collaboration with the Royal Society for the Protection of Birds (RSPB), has embarked on a groundbreaking study to test the effectiveness of this innovative treatment on two other persistent invasive species—Laurel (Prunus laurocerasus) and Rhododendron (Rhododendron ponticum). These species pose a considerable threat to native biodiversity, particularly in woodland and conservation areas, where they outcompete native flora and disrupt ecosystems.

The Impact of Laurel and Rhododendron

Both Laurel and Rhododendron are well-known for their rapid spread and ability to dominate landscapes. Their thick, evergreen foliage suppresses the growth of native plants by blocking sunlight, while their chemical compounds inhibit seed germination in the surrounding soil. These characteristics make traditional control methods, such as mechanical removal and herbicide application, challenging and often ineffective in the long term.

The Role of Thermo-Electric Eradication

Thermo-electric eradication is a pioneering approach that utilises controlled electrical currents to target and destroy plant root systems. This method offers several advantages over conventional treatments:

  • Eco-Friendly – Unlike chemical herbicides, thermo-electric eradication does not introduce toxins into the environment, making it a preferable option for conservation areas.
  • Highly Effective – The electrical currents penetrate deep into the root structures, ensuring that plants do not regrow after treatment.
  • Minimal Soil Disturbance – Unlike excavation, this approach preserves soil integrity and prevents erosion.

The RSPB Collaboration

The RSPB is committed to preserving and restoring natural habitats across the UK. Given the detrimental impact of Laurel and Rhododendron on woodland ecosystems, the organisation has partnered with the Japanese Knotweed Agency to explore sustainable and effective control measures. The study involves:

  • Field Trials in Conservation Sites – Selected test sites within RSPB reserves have been identified where Laurel and Rhododendron have become problematic.
  • Application of Thermo-Electric Treatment – Specialists apply the technology to targeted plant populations, assessing its impact on plant health and regrowth rates.
  • Monitoring and Data Collection – The effectiveness of the treatment is monitored over multiple seasons to evaluate its long-term success in preventing regrowth.

Early Findings and Future Potential

Preliminary results from the trials indicate promising outcomes. Early signs of root system degradation and plant dieback have been observed within weeks of treatment. If successful, this method could revolutionise how invasive woody species are managed, particularly in environmentally sensitive areas where chemical herbicides are not a viable option.

The next phase of the study will focus on optimising treatment protocols, assessing potential impacts on non-target species, and scaling the approach for broader conservation use.

Conclusion

The partnership between the Japanese Knotweed Agency and the RSPB represents a significant step forward in sustainable invasive species management. If thermo-electric eradication proves to be as effective on Laurel and Rhododendron as it has been on Japanese Knotweed, it could become a game-changer for conservationists and land managers across the UK.

For more information on this project or to explore how thermo-electric technology could help control invasive species on your land, keep an eye on our Case Studies on our website where we will be uploading an initial file and ongoing updates through 2025.