Non-native Phragmites is a highly invasive plant that can invade wetlands and shorelines, outcompete native vegetation, and degrade wildlife habitat. Fortunately, most of the infestations in Minnesota are small and there is hope that the invasive grass can be controlled.

Coon Creek Watershed District and ACD staff first detected non-native Phragmites in Anoka County in 2018 along the Ham Lake shoreline. The 2,500 square foot stand was herbicide treated in fall 2018 and mowed in January 2019. No Phragmites was found at the Ham Lake site in 2019 and 2020. One sprout of Phragmites was found in 2021 and dug up.

Additional non-native Phragmites infestations have been found and verified by UMN in Anoka County. The treatment success at Ham Lake inspired staff to continue additional efforts to control non-native Phragmites. In 2019, the Anoka County AIS Prevention grant paid for treatment of 14 additional Phragmites sites that were detected in the 2019 growing season.

The MN Department of Agriculture Noxious Weed grant provided funds for the Metro Counties to collaborate and treat over 80 sites in 2020 and 2021. The University of MN, MN DNR, and MN DOT are also tracking and treating additional sites throughout the state. Sites will continue to be monitored to determine treatment needs.

Photo below shows a stand of Phragmites at a site in Anoka County being monitored in 2020. Follow up treatment occurred in September 2021.

Find more information and distribution maps can be found at the links below:

https://www.eddmaps.org/distribution/viewmap.cfm?sub=59038

https://www.dnr.state.mn.us/invasives/aquaticplants/phragmites/index.html

https://maisrc.umn.edu/phragmites

Anoka Conservation District has been working with the City of Anoka and Mississippi Park Connection to create a more resilient landscape at Kings Island. Efforts have begun to remove invasive buckthorn from the island to allow space and light for native plant regeneration. Invasive emerald ash borer (EAB) infestations that kill ash trees have been detected throughout the Metro region and near Kings Island. Approximately 50% of Kings Island canopy is ash (green, black or white ash) so a loss of ash would have a great impact on the habitat on Kings Island. Surveys have and will continue to be conducted to monitor for the presence of EAB. To prepare for the loss of ash trees and create a more resilient landscape at Kings Island, a diversity of tree and shrubs were planted by volunteers. Species planted include Nannyberry (Viburnum lentago), Red-oiser Dogwood (Cornus sericea), Swamp white oak (Quercus bicolor), Butternut (Juglans cinerea), Cottonwood (Populus deltoids), Hackberry (Celtis occidentalis), Highbush Cranberry (Viburnum trilobum), and Sycamore (Platanus occidentalis) a tree with a more southern range. More efforts are needed to control buckthorn and create diversity for a more resilient landscape at Kings Island. 

The Anoka Conservation District, US Fish and Wildlife Service, and Anoka County Parks are collaborating to restore hydrology and enhance five acres of wetland and one acre of upland prairie at Anoka County Park's Cedar Creek Conservation Area. Two wetland basins were enhanced by installing sheet piling ditch plugs and adding fill material in a private ditch that was draining the wetlands. A berm to prevent water from entering the ditch was constructed to enhance a third wetland basin. Non-native reed canary grass biomass and root sod was scraped from these wetland basins and used to fill the ditch. Construction is complete and vegetation management will occur on these three basins and two additional basins in the area for the next five years using funds from the Lessard-Sams Outdoor Heritage Council. The goal is to convert these once drained wetlands that were dominated by reed canary grass to wetlands with native vegetation and greater water holding capacity. This will provide benefits to water quality and improve wildlife habitat.