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Cut-leaved teasel (Dipsacus laciniatus)
Herbaceous, monocarpic perennial. Grows as a basal rosette for at least one year. Forms a prickly, angled flowering stalk, 2-6’ tall, typically in second or third year.
Cut-leaved teasel is Restricted (Orange counties)
- Invades open areas, including prairies, savannas, and sedge meadows, as well as roadsides and disturbed areas.
- Rapid range expansion of cut-leaved teasel has been observed in several Midwestern states.
Classification in Wisconsin: Restricted
Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. The recommendation for cut-leaved teasel was based upon this literature review developed by the department.
Leaves: Opposite, large (up to 1.5’ long), oblong, and prickly. Leaves of flowering plants join into cup around stem. Leaves of cut-leaved teasel are broader and have deep, feathering lobes.
Flowers: Hundreds of small flowers, clustered in dense, egg-shaped heads. Stiff, spiny, leaf-like bracts curve up from base of flower head. Cut-leaved teasel has bracts shorter than the flower heads, white flowers and blooms from July-September.
Fruits & seeds: Each plant can produce as many as 2,000 seeds. Seeds remain viable in the soil for at least 2 years.
Roots: Deep taproot, up to 2’ long and 1” in diameter.
Similar species: Common teasel (Dipsacus fullonum) leaves are not lobed and flower bracts are longer than the flower heads. Flowers are purple and bloom from June-October.
Counties in WI where cut-leaved teasel has been reported (as of July 2011). Both vouchered and unvouchered reports included.
Do you have cut-leaved teasel in your county but it isn't shaded on the map? Send us a report.
Mechanical: Rosettes can be dug up making sure to remove as much of the root as possible. Mature plants can be cut in full bud stage; plant will re-sprout but will not flower. Bag and dispose of stems. Late spring burns.
Chemical: Foliar spray with triclopyr, clopyralid, aminopyralid, or metsulfuron before plant has bolted. Spray rosettes in fall with glyphosate.
For more information on control techniques, visit the Teasels factsheet by University of Wisconsin-Extension.
View cut-leaved teasel pictures in our photo gallery!
Sources for content:
- Czarapata, Elizabeth; Invasive Plants of the Upper Midwest: an illustrated guide to their identification and control. University of Wisconsin Press. 2005. Pg. 59-61
- University of Wisconsin-Extension Weed Science
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