Spotted Knapweed | Cornell Weed Identification
Spotted Knapweed (Centaurea maculosa) is a biennial or short-lived perennial that is commonly found throughout the northeast and central-north of the US. This weed typical grows on dry, low-fertility soils, and is a problem in New York pastures and disturbed areas. It is considered a widespread invasive species across New York.
measurable life history stages of spotted knapweed; seeds, seedlings, rosettes, and flowering plants. Spotted knapweed reproduces only by seeds. Seed production of spotted knapweed in western Montana ranged from 10,760 to 83,950 per square foot on an Idaho fescue habitat-type (Jacobs and Sheley, 1998), was measured at
Spotted knapweed (Centaurea stoebe subspecies micranthos)
Spotted knapweed is a biennial or short-lived perennial herbaceous plant that grows two to three feet tall. It can form dense cover in prairies, pastures, and open habitats. Cattle and other animals avoid eating it so it can cause large reductions in available food for grazing animals.
Centaurea stoebe - Wikipedia
Centaurea stoebe, the spotted knapweed or panicled knapweed, [1] is a species of Centaurea native to eastern Europe, although it has spread to North America, where it is considered an invasive species. It forms a tumbleweed, helping to increase the species' reach, and the seeds are also enabled by a feathery pappus.
Spotted knapweed infests a variety of natural and semi-natural habitats including barrens, fields, forests, prairies, meadows, pastures, and rangelands. It outcompetes native plant species, reduces native plant and animal biodiversity, and decreases forage …
Spotted Knapweed | National Invasive Species Information Center
Species Profile: Spotted Knapweed. Crowds out native species and forage for livestock (Zouhar 2001)
Spotted knapweed, a class-B non-designate noxious weed in Lincoln County, Washington (Centaurea biebersteinii) is of the Asteraceae family. Spotted knapweed is a native of central Europe and has also been called bachelor’s button. In past times, young women wore spotted knapweed flowers to attract bachelors. Spotted knapweed is a short-lived ...
Spotted Knapweed - CWMA
Spotted knapweed is a highly competitive weed that invades disturbed areas and degrades desirable plant communities. It forms near monocultures in some areas of western North America (FEIS 1998). There is evidence that spotted knapweed may produce allelopathic chemicals that inhibit the growth of other plants (Rutledge and McLendon, 1998).
Spotted knapweed infestations lower the number and diversity of native plants with the potential for large-scale and long-term ecosystem-level effects including reduced wildlife habitat and increased surface water runoff and subsequent erosion (Duncan et al. 2001).
Spotted knapweed - Extension at the University of Minnesota
Spotted knapweed is an invasive species. Spotted knapweed is found in artificial corridors such as gravel pits, railroad beds and field margins, and can spread to nearby woodlands and prairies. Seeds are dispersed by rodents, livestock and commercial hay.