Fall is a great time to manage buckthorn on your property. Common and glossy buckthorn are invasive woody shrubs which aggressively outcompete native plants, disrupting the habitat benefits they provide. Buckthorn chemically alters the soil, creating an inhospitable environment for other plants.
Buckthorn leaves stay green longer than most other Minnesota woodland trees and shrubs so you'll easily notice them in mid to late October.
Common buckthorn (Rhamnus cathartica) can be found in upland forests. Look for the thorn, which can be found at the end of some branches. Glossy buckthorn (Frangula alnus) tends to grow in slightly wetter areas but can be found in a variety of habitats. There are no thorns. Look for the rust colored terminal bud.

New research from the University of MN suggests that buckthorn seeds do not persist in the soil for 6+ years as was previously thought. Their findings suggest that over 97% of seeds germinate in the first year. As you manage buckthorn, aim to prevent seed production on mature plants with mid-summer cutting and follow up with treatment of the small sprouts for the best results.

See ACD's buckthorn fact sheet for tips on identifying buckthorn, to learn about native look-alikes, and compare methods for controlling common and glossy buckthorn. For more information contact Logan Olson, Restoration Technician, at This email address is being protected from spambots. You need JavaScript enabled to view it.

Knotweed is a species of increasing concern with several new populations across Anoka County. Knotweeds are herbaceous shrubs characterized by a sturdy, bamboo-like stalk which can grow to over 10 feet in a single season. They grow aggressively, especially along riparian areas where they outcompete native vegetation and create bare ground which enhances erosion damage. Knotweed can also grow through sidewalks and concrete foundations, damaging infrastructure.

There are three species of knotweed in MN: Giant, Japanese, and Bohemian which is a hybrid of the first two. All three Knotweed species are on the state noxious weed list as Prohibited Control species. Efforts must be made to stop their spread and propagation. Late August into September is the easiest time to spot Knotweed infestations due to their showy white flowers. You can help keep this species under control by entering sightings into EDDMaps or reporting them to ACD staff.

See links for Giant, Japanese, and Bohemian knotweed ID and knotweed management guidance from the MDA. 

For more information contact Logan Olson, Restoration Technician, at  This email address is being protected from spambots. You need JavaScript enabled to view it.  

Get involved in improving water quality by adopting a storm drain! Preventing trash, leaves, and debris from entering storm drains keeps local lakes and rivers cleaner. All it takes is 15 minutes, twice a month. Learn more and sign up by visiting mn.adopt-a-drain.org. 

The MN Board of Water and Soil Resources (BWSR) is accepting applications for the Lawns to Legumes grant program through June 30, 2023. Any Minnesota landowner can apply for up to $350 in reimbursements for creating new pollinator habitat on their property. This includes pollinator gardens or meadows, bee lawns, and native tree or shrub plantings.

Grant recipients must contribute 25% match in the form of purchasing materials, hiring contractors, or as in-kind time spent planting and maintaining the project.

Find resources for planning your pollinator planting, choosing native plants, and applying for a grant on the BWSR Lawns to Legumes website.