Cut-leaf Teasel

Cut-leaf teasel is beginning to become a serious problem in Calumet County. There are a number of significant patches of this invasive plant in the County, mostly in the Towns of Harrison, Brillion and Stockbridge. Each plant can produce up to 2,000 seeds, so preventing every single plant from going to seed is critical at this stage of infestation. As greater numbers of these plants spread in to Calumet County along major highways from the north, west and east, it is imperative that we stop the spread now.

Teasel grows as a basal rosette for a minimum of one year, then sends up a tall, flowering stalk and dies after flowering. The rosette stage varies according to the amount of time needed to acquire enough resources for flowering to occur. Teasel's unique small oval-shaped white flower heads makes the plant easily identifiable when flowers or seed heads are present. Flowering stems may reach 6-8 feet in height. Cut-leaf teasel blooms from July through September. For additional information visit http://dnr.wi.gov/invasives/fact/teasel_cut.htm