Fighting Back Against Rhododendron: Why Mapping and Planning Matter

The recent news from Killarney National Park, where new machinery is making serious progress in the decades-long effort to remove Rhododendron ponticum, is a major win for biodiversity in Ireland. The flowering shrub, introduced in the 1800s, has overrun large parts of the park, outcompeting native plants and transforming habitats critical for rare wildlife.

The National Parks and Wildlife Service and countless volunteers have been battling this invasive species for decades—and the scale of their work is nothing short of inspiring. With the right tools and continued commitment, real progress is being made.

But there’s a side to this work that doesn’t always make the headlines: the meticulous planning, mapping and ecological oversight that makes large-scale eradication possible.

At Wetland Surveys Ireland, our ecologists have supported similar projects through detailed field mapping and strategic planning—work that lays the foundation for effective removal while protecting nearby sensitive habitats, watercourses, and breeding birds.

For example, in projects like Bundorragha and Erriff, we conducted on-the-ground mapping of Rhododendron based on infestation levels, habitat type, and proximity to conservation features. Using best practice guidance, we helped inform when and where specific techniques should be used.

We are also currently supporting the Dúlra Rhododendron Mapping Project with expert input and mapping tools to manage incoming field data in real-time via ArcGIS Online, providing training support to ensure accurate and accessible information is available for follow-up eradication efforts.

Eradication isn’t just about having the right machine—it’s about using it in the right place, at the right time, and for the right reasons. The news from Killarney is a welcome boost in the battle against invasive species, it’s also a reminder of how important ecological mapping, planning, and monitoring are in getting the job done efficiently and sustainably.

If you’re involved in a habitat restoration or invasive species project and need ecological support, feel free to get in touch—we’d be happy to help.