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Species
Information
- musk
thistle
- Carduus
nutans
L.
- USDA
Symbol: CANU4
- Oregon
Noxious Weed Designation: B, T
- Pictures
Identification:
Biennial; blooms in early June. Grows 3 to 6 ft tall. Flower heads large, purple, solitary and usually nodding.
Impacts: An aggressive plant that spreads rapidly to form nearly impenetrable stands, often displacing desirable forage. Found in pasture, range and timberlands, it spreads by seeds, taking advantage of human disturbance. Klamath County is the most heavily infested musk thistle county in Oregon.
Biological
Controls: Six biocontrol agents have been approved for release. Three of these, a crown weevil, a seed head weevil and a flower fly, have been established in Oregon.
Oregon
Maps of Musk Thistle Distribution
Links:
USDA
Plants Database information on musk thistle
GRIN
Database information on musk thistle
Oregon Department
of Agriculture information on musk
thistle
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