Common Teasel

Common teasel is in the early stages of infestation in Calumet County. There are only a few patches, most of them off Lakeshore Drive, Joe Road and Cemetery Road. This plant can be contained and eliminated from Calumet County with a little bit of effort. Each plant can produce up to 2,000 seeds, so preventing every plant from going to seed is critical at this early stage of infestation.

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 purple flower heads makes the plant easily identifiable when flowers or seed heads are present. Flowering stems may reach 6-7 feet in height. Common teasel blooms from June through October. For additional information visit http://dnr.wi.gov/invasives/fact/teasel_cut.htm