Bull Thistle - Minnesota Board of Water and Soil Resources
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Bull Thistle Cirsium vulgare Minnesota C-Value: 0 Wetland Indicator Status: FACU- Non-native Leaves: 8 - 15 cm long, alternate, lance shaped. Deeply lobed, with each lobe ending in a stiff spine. Rough and hairy on upper surface with soft whitish hairs underneath. Stems: 2-6 ft tall with upright branches. Leaf sheath extends down stem as spiny wings. Stems are sparsely hairy. Flowers and fruit: Pinkish purple flower heads, up to 4 cm wide. Clustered or solitary at the end of branches. Surrounded by spiny bracts. In bloom July through September. Plant communities: Uplands, pastures, roadsides, and other disturbed areas. Comments: Biennial. Prohibited noxious weed in Minnesota. Generally found as single or scattered plants. 2010 Winged stem Wooly leaf underside Texture of leaf surface Spines
Transcript of Bull Thistle - Minnesota Board of Water and Soil Resources
Bull ThistleCirsium vulgare
Minnesota C-Value: 0Wetland Indicator Status: FACU-Non-native
Leaves: 8 - 15 cm long, alternate, lance shaped. Deeply lobed, with each lobe ending in a stiff spine. Rough and hairy on upper surface with soft whitish hairs underneath.
Stems: 2-6 ft tall with upright branches. Leaf sheath extends down stem as spiny wings. Stems are sparsely hairy.
Flowers and fruit: Pinkish purple flower heads, up to 4 cm wide. Clustered or solitary at the end of branches. Surrounded by spiny bracts. In bloom July through September.
Plant communities: Uplands, pastures, roadsides, and other disturbed areas.
Comments: Biennial. Prohibited noxious weed in Minnesota. Generally found as single or scattered plants.
2010
Winged stem
Wooly leaf underside
Texture of leaf surface
Spines
