Northwoods Cooperative Weed Management Area
Northwoods Cooperative Weed Management Area

Working Together to Protect Northern Wisconsin from Invasive Species

Invasive Species and Alternative Control Methods Workshop

The NCWMA hosted a daylong workshop on Invasive Species and Alternative Control Methods on July 20th at the Northern Great Lakes Visitor Center in Ashland, Wisconsin. Forty-five people attended the event. The day was jam-packed with interesting presentations and field trips. Thanks to everyone who attended and presented! Thanks to the Whittlesey National Wildlife Refuge for bus transportation and to the U.S. Forest Service for providing a great venue for the event.


Photo: Steve Garske from the Great Lakes Indian Fish and Wildlife Commission (GLIFWC) demonstrates a biocontrol insect collecting device for managing leafy spurge.

Check out the NCWMA's 2022 Annual Report!

The NCWMA hired five seasonal workers and treated 34 sites of garlic mustard, 114 sites of knotweed, along with wild parsnip, teasel Dalmatian toadflax, butterfly dock, cattail, yellow flag iris, and Phragmites. Learn all the details.

High Priority Invasive Species in the NCWMA

Below are a few high priority invasive species of the NCWMA.  Click this link for information on these and other high priority invasive species in our region.

Garlic Mustard

Garlic Mustard spreads quickly through rich hardwood forests.  Volunteers can help hand-pull garlic mustard in the spring! Read more!


Giant, Japanese, and Bohemian Knotweeds were planted in yards throughout the region.   Read more on basic identification and the NCWMA Knotweed Project.

Wild Parsnip

Watch out for wild parsnip!  This invasive species can cause severe blisters when sap on skin is exposed to light.  Read more!

Giant Hogweed

Giant in every way!  The sap is toxic to skin.  This species is rare in our area.  Learn how to identify it.

Invasive Bushes

Exotic buckthorns, honeysuckles and Japanese barberry are ornamental bushes that invade forests.  Learn more.


Cut-leaf and common teasels are uncommon in the area.  The NCWMA would like to eradicate all sites.  Learn more.


Invasive Phragmites (common reed) takes over wetlands. Learn more

Purple Loosestrife

Purple loosestrife is pretty, but invasive in wetlands throughout the area. Learn more.

Garden Valerian

Garden valerian has become very common along roads and fields in Douglas and Bayfield County. Learn more.

Yellow Flag Iris

Yellow flag iris is taking over shorelines of lakes and rivers. Learn more!

Leafy Spurge

This species is poisonous to cattle and takes over fields. Its deep roots make it difficult to control. Learn more!

European Swamp Thistle

This is a wetland thistle spreading from NE Wisconsin. Learn more.

Photos from NCWMA Events

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