New research from the University of Minnesota reveals that land managers can effectively combat the invasive buckthorn species by planting native grasses and wildflowers immediately after removal. This strategy was detailed in a study published on July 7, 2026, in Forest Ecology and Management.
Effective Management of Buckthorn
Common buckthorn, scientifically known as Rhamnus cathartica, is one of Minnesota's most aggressive invasive plants. The study emphasizes the importance of timely restoration, showing that sowing native plants right after buckthorn removal significantly improves control over its regrowth. Researchers from the Cover It Up! Project found that herbicide applications, when used promptly after initial removal, greatly enhance the effectiveness of management strategies.
In the study, researchers compared two approaches: immediate herbicide treatment of buckthorn resprouts versus delayed treatment. They found that:
- Applying fosamine ammonium (Krenite) the year after removal effectively kills a substantial number of buckthorn plants.
- A follow-up treatment two years later can nearly eradicate all buckthorn.
- Delaying herbicide treatment results in less effective buckthorn control.
Importance of Native Plant Seeding
Seeding native plants right after the first treatment not only helps suppress buckthorn by competing with its seedlings but also enhances the overall ecosystem health. This method is particularly effective in areas with sparse tree canopies, allowing native species to thrive.
