All the purple blooms are for 1 plant!! General: Spotted Knapweed is a biennial or short-lived perennial.It starts out as a rosette and can remain that way for several years before bolting and dying in a subsequent season. Common Name: Spotted KnapweedScientific Name: Centaurea stoebe L. ssp. The hybrid, known from ; Spotted knapweed has a deep, stout taproot and basal rosette leaves that grow up to 8 inches (20 cm) long and 2 inches (5 cm) wide. Copyright: various copyright holders. Spotted knapweed Scientific classification Kingdom: Plantae: Angiosperms: Eudicots: Asterids Order: Asterales Family: Asteraceae Tribe: Cynareae Genus: Centaurea Species: C. stoebe Binomial name Centaurea stoebe Lam. ssp. 13. Spotted knapweed is more intolerant to dense shade and prefers moister habitats than diffuse knapweed; however, spotted knapweed is still a problem in forested areas disturbed by All non-native invasive species, including Japanese knotweed, black locust, and spotted knapweed, are a concern at the refuge. It can be found nearly everywhere in Montana. Spotted Knapweed (Centaurea maculosa), native to Eastern Europe, is an invasive species on the North American continent. Habitat: Native to Eastern Europe, spotted knapweed is commonly found on well-drained, light to coarse textured soils, but is Intolerant of dense shade. Spotted Knapweed was formerly (or incorrectly) known as Centaurea biebersteinii and Centaurea maculosa. They damage the efficiency and biodiversity of ecosystems through both direct (e.g. In Nevada, there are records of this weed in White Pine, Lincoln, Washoe, Elko, and Nye counties. Spotted & Diffuse Knapweed Centaurea biebersteinii, Centaurea diffusa. VT. Fields, railroads, open rights-of-way, 
sandy or gravelly banks. It is found growing in a wide range of natural and disturbed habitats. Centaurea maculosa Lam. It also produces a chemical that is toxic to other plants, allowing it to spread quickly and become established. MA, 
 is morphologically variable. Habitat Spotted knapweed is a highly adaptable plant. GENERAL BOTANICAL CHARACTERISTICS: Spotted knapweed is a nonnative, perennial forb that can live at least 9 years.Plants more than 7 years old may have high incidence of root rot, indicatingsenescence [16]. Centaurea stoebe ssp. Habitat Occurs in rangeland, meadows, roadsides, open and sandy soils. Habitat Top of page Spotted knapweed infests roadsides, waste areas, plains and dry rangelands and prefers well-drained, light-textured soils. Spotted knapweed roots exude a chemical that inhibits the root growth of other plants. Knapweed invasions cause losses averaging up to 63 percent of available grazing forage. donations to help keep this site free and up to date for It was probably introduced to North America from Europe as a contaminent in alfalfa seed or in ships' ballast. Exact status definitions can vary from state to C. stoebe L. ssp. Through symbiotic association with a fungus found in the soil, S. Knapweed can divert carbon from otherwise competitive grass species. DISTRIBUTION AND HABITAT Spotted knapweed was accidentally introduced into North America from Eastern Europe and Asia Minor in the late 1800s. C. maculosa Lam. Spotted knapweed is invading rangeland throughout the western United States. 711 TTY, © Copyright 2021 Minnesota Department of Agriculture, Farm, Property, Real Estate Listing (MN FarmLink), Agriculture Chemical Response & Reimbursement Account, Agricultural Best Management Practices (AgBMP) Loan, Agricultural Growth, Research & Innovation (AGRI) Program, Sustainable Agriculture Demonstration (AGRI), More Business Development, Loans, Grants Topics, Minnesota Ag Water Quality Certification Program, Certified Testing Laboratories (soil & manure), Fertilizer Tonnage Reporting & Inspection Fees, Pesticide Dealer Licensing & Sales Reporting, local University of Minnesota extension agent, Spotted knapweed lifecycle and treatment timing graphic, Department of Natural Resources fact sheet. Habitat: Spotted knapweed is found at elevations up to and over 10,000 feet and in precipitation zones receiving 8 to 80 inches of rain annually. Habitat preferences: Found in fields, roadsides, and other open areas, from the plains to the mountains.