- Carduus nutans is an herbaceous, biennial plant that grows to 6 ft. (1.8 m) tall. The stem has very spiny wings. Carduus species may hybridize with each other.
- Leaves are green and lanceolate to oblong-lanceolate. They are often pinnatifid and are very prickly. Leaves are usually sessile to slightly clasping. Basal leaves are 4-16 in. (10-40 cm) long. Leaf characteristics are variable across different varieties and subspecies.
- Showy, solitary, hemispherical, red to purple, disk flowers bloom from June to September. Phyllaries are spinetipped and overlap with several rows.
- Fruits are small achenes, 1.52 in. (45 mm) long, about 0.04 in. (1 mm) in diameter, including a white to light brown pappus. The seeds have longitudinal dotted stripes.
- Ecological Threat
- Carduus nutans invades a variety of disturbed areas. Pastures are particularly at risk because It is unpalatable to livestock. Once established it can spread rapidly due to high seed production (as much as 120,000 seed per plant). Carduus nutans is native to Western Europe and was accidentally introduced into the United States in the early 1900s.
- Biological Control of Invasive Plants in the Eastern United States - USDA Forest Service
- Southeast Exotic Pest Plant Council Invasive Plant Manual - SE-EPPC
- Fire Effects Information System - USDA Forest Service
- Weeds Gone Wild: Alien Plant Invaders of Natural Areas - Plant Conservation Alliance
- Element Stewardship Abstract - The Nature Conservancy
- Weed of the Week - USDA Forest Service
- Weed Field Guides - USDA Forest Service
Image Sets View other image sets:
EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Most Troublesome / Most Common Agricultural Weed List
This map identifies those states that consider this species either most troublesome or most common in at least one commodity. For more information, visit the MTMC project page.
|No Data for this state|
|Troublesome or Common weed in one or more crops|
Invasive Listing Sources
- Alabama Invasive Plant Council
- California Invasive Plant Council
- California Noxious Weeds
- Colorado Noxious Weeds
- Commonwealth of Pennsylvania, Department of Conservation and Natural Resources, 1994.
- Faith Campbell, 1998
- Georgia Exotic Pest Plant Council - Category 3
- Great Lakes Early Detection Network
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Idaho Noxious Weeds
- Illinois Invasive Plant List
- Illinois Noxious Weeds
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Kansas Noxious Weeds
- Kentucky Exotic Pest Plant Council - Severe Threat
- Maryland Noxious Weeds
- Michigan Noxious Weeds
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Minnesota Noxious Weeds
- Missouri Department of Conservation,
- Missouri Noxious Weeds
- Nebraska Noxious Weeds
- Nevada Noxious Weeds
- New Hampshire Restricted Invasive Species
- New Jersey Department of Agriculture, Division of Plant Industry, 2004
- New Mexico Noxious Weeds
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- North Carolina Noxious Weeds - Class B
- North Dakota Noxious Weeds
- Ohio Noxious Weeds
- Oklahoma Noxious Weeds
- Oregon Noxious Weeds
- Pacific Northwest Exotic Pest Plant Council, 1998
- Pennsylvania Noxious Weeds
- South Carolina Exotic Pest Plant Council - Significant Threat
- South Dakota Noxious Weeds
- Tennessee Exotic Pest Plant Council
- Utah Noxious Weeds
- Washington Noxious Weeds
- WeedUS - Database of Plants Invading Natural Areas in the United States
- West Virginia Noxious Weeds
- Wisconsin's Invasive Species Identification, Classification and Control Rule
- Wyoming Noxious Weeds
Other System LinksPlants: CANU4
NPDN Pest: PBFAQBC
NPDN Host: 28151
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|