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European marsh thistle stem and flowers

European marsh thistle (Cirsium palustre)

Herbaceous biennial or monocarpic perennial. First year plants overwinter in rosette stage; flowering stems are 4-5’ tall, erect, thick, sometimes reddish in color, branched at the top and bristling with spiny wings aligned with the stem. Much of plant covered in long, sticky hairs.

Overview

Regulated areas of European marsh thistle
European marsh thistle is Prohibited (Red counties) and Restricted (Orange Counties)

Other names for this plant include:

  • Common names: European swamp thistle, marsh thistle

Ecological threat:

  • Prefers moist, acidic soils and is somewhat shade tolerant. Found along roadsides, old fields, in wetlands, forest edges, beach and dune areas. In Wisconsin, European marsh thistle occurs in localized populations, primarily in northern counties.
  • Once introduced, this plant can aggressively colonize natural areas, decrease biodiversity and compromise the ecological integrity of an area.
  • Spontaneous hybrids between European marsh thistle and Canada thistle have been reported from European countries.

Classification in Wisconsin: Prohibited/Restricted (Restricted in Ashland, Bayfield, Chippewa, [Clark,] Door, Florence, Forest, Iron, Langlade, Lincoln, Marathon, Marinette, Menominee, Oconto, Oneida, Price, Rusk, Sawyer, Shawano, Taylor and Vilas counties; Prohibited elsewhere)

Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. The recommendation for European marsh thistle was based upon this literature review developed by the department.

Identification

Leaves: First-year rosettes are spiny, long, deeply lobed and hairy on the underside. On second year flowering plants, leaves are 6 to 8 inches long near the base and shorter toward the top and tipped with spines.

Flowers: Clusters of 12 or more spiny purple flower heads up to 0.75" wide; bracts have spineless tips. Typically bloom in June and July.

Fruits & seeds: Small, hard and elongated with a tuft of feathery bristles at the top. Dispersed by wind.

Roots: Fibrous.

Similar species: Canada thistle (Cirsium arvense; invasive) has spiny leaves, but non-spiny stems and flower heads. Bull thistle (Cirsium vulgare; invasive) and plumeless thistle (Carduus acanthoides; invasive) have sharply spined leaves, stems and flower heads.

Native marsh thistle (Cirsium muticum), occurs in similar habitats as European marsh thistle, but has non-spiny stems and flower heads.

Distribution

Known county distribution of European marsh thistle
Counties in WI where European marsh thistle has been reported (as of July 2011). Both vouchered and unvouchered reports included.

Do you have European marsh thistle in your county but it isn't shaded on the map? Send us a report.

Control

Mechanical: Hand-pull or dig rosettes. Repeated pulling and mowing (minimum 3 times per growing season) will weaken second year plants; mow when flower buds are just about to open.

Chemical: Foliar spray glyphosate during the early bolting phase when plants are 6-10” tall, during the bud to flower phase, or applied to rosettes in the fall. Foliar spray with clopyralid or aminopyralid.

Biological: Field trials are ongoing in Canada using the Rhinocyllus conicus weevil.

Photos

View European marsh thistle pictures in our photo gallery!

Resources

Sources for content:

Links for More Information:

Last revised: Monday December 11 2017