Using plants to control buckthorn: an expanded approach
Peter Reich, Forest Resources
Minnesotans spend millions each year removing buckthorn (Rhamnus cathartica). Yet the invasive shrub often returns to the same spots again and again. This vicious cycle happens because buckthorn is better at filling empty spaces in an ecosystem than most other native plants.
“Cover it Up!,” led by MITPPC-funded ecologist Peter Reich, is developing strategies that will improve and diversify the native plant community while keeping buckthorn away for good. Phase I of the project established that dense revegetation through native shrubs can reduce buckthorn recolonization by blocking at least 96% of incoming light.
With Phase II, detailed here, Reich’s team will expand their study from the Twin Cities metro into Greater Minnesota and explore how managers throughout the state can suppress buckthorn for the longest time and at the lowest cost. A network of citizen scientists will help carry out experiments in woodland areas across Minnesota.
If effective, the revegetation treatments designed and tested here can serve as a template for managers throughout Minnesota, potentially resulting in significant cost and labor savings and improving the health of woodlands by excluding invaders, reducing herbicide applications, and increasing forest understory plant diversity.
What native planting and seeding techniques can reduce the recurrence of buckthorn after removal?
How effective are revegetation methods in environments across Minnesota?
This work could change the way we think about buckthorn management, helping Minnesota land managers save significant time and money in their long-term restoration efforts. If successful, it promises to improve the health of Minnesota forests by reducing herbicide applications and increasing understory plant diversity.
UMN Extensions, Stantec, Minnesota DNR, St. Croix Watershed Research Station, Three Rivers Park District, Ramsey County
Peter Reich, principal investigator
Peter Wragg, post-doctoral associate
Michael Schuster, post-doctoral associate
Abbie Anderson, citizen science coordinator
News & Publications
- Increased light availability due to forestry mowing of invasive European buckthorn promotes its regeneration (Restoration Ecology, 2020)
- Cover it Up! Buckthorn Control
- "Forests 'can take cover to resist alien invaders'" BBC News. May 2020
- Krenite (fosamine ammonium) impacts on targeted invasive shrub Rhamnus cathartica and non-target herbs (Invasive Plant Science and Management, 2002)
- Phenology matters: Extended spring and autumn canopy cover increases biotic resistance of forests to invasion by common buckthorn (Rhamnus cathartica) (Forest Ecology and Management, 2020)
- Revegetation to slow buckthorn reinvasion: Strengths and limits of evaluating management techniques retrospectively (Restoration Ecology, 2020)
- "Cover it Up 2" Project Website
- Using revegetation to suppress invasive plants in grasslands and forests (Journal of Applied Ecology, 2018)
- "Battling buckthorn to restore natural resistance" Science Museum of Minnesota
Invasive plants in Minnesota are “joining the locals”: A trait‐based analysis (Journal of Vegetation Science, 2018)
A tale of two studies: Detection and attribution of the impacts of invasive plants in observational surveys (Journal of Applied Ecology, 2017)
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