Weed Description A biennial or occasionally perennial that forms a basal rosette during the first year of growth and produces a flowering stem during the second year. Spotted Knapweed is one of 3 targeted plant species in Minnesota with an active bio-control program, the other 2 species are leafy spurge and purple loosestrife. Spotted Knapweed was formerly (or incorrectly) known as Centaurea biebersteinii and Centaurea maculosa. Report a Sighting. Its name is derived from the spots formed by black margins on the flower bract tips. Seedlings Cotyledons round at the apex and narrowing to the base. Spotted—pink to purple finely dissected compound daisy flowers with black fringe; June to September. Height to 4 ft.; rosette first year. A study by Kelsey and Mihalovich (1987) found that spotted knapweed collected before flowering contained neutral detergent fiber (24.2-53.0% in dry weight), ether extract (3.1-9.0%), crude protein (6.2-18.2%), total non-structural carbohydrates (11.0- 27.5%), ash (4.9 to 9.3%), in vitro dry … It is also an invasive species in the United States, and particularly widespread in dryer regions of the Pacific Northwest. Description: Spotted Knapweed is a biennial or short-lived perennial with several branched, upright stems growing from a stout taproot and usually grows up to 3 feet tall. Fruit/Seed Description: Seeds are 0.1 inch (2.5 mm) long, black or brown and oval. Invasive Plants in Pennsylvania: Black, Brown and Spotted Knapweed (PDF | 1.2 MB) Pennsylvania Department of Conservation and Natural Resources. Stem Description: Spotted knapweed stems are upright and branched, with larger plants being more branched than smaller plants. Spotted knapweed typically forms a basal rosette of leaves in its first year and flowers in subsequent years. micranthos (Gugler) Hayek (Aster family, Asteraceae) Description . Description. Seeds and plant fragments make their way into hay and the undercarriages of vehicles, allowing for new infestations over great distances. Spotted knapweed is a prolific seed producer, with individual plants producing up to 140,000 seeds per square metre. State designated noxious weed. Spotted knapweed is primarily a weed of pastures, hayfields, roadsides, and sometimes turfgrass. DESCRIPTION Spotted knapweed is a biennial or short-lived perennial. ND-Spotted Knapweed (NDSU Extension) (CEBI2) NJ-Rutgers Cooperative Extension (CEBI2) OH-Ohio Perennial and Biennial Weed Guide (CESTM) PA-Pennsylvania Flora Abstract (CESTM) Plant Conservation Alliance-Alien Plant Working Group (CESTM) TNC-Global Invasive Species Initiative (CESTM) USDA FS Fire Effects Information System (FEIS) (CESTM) Centaurea stoebe, the spotted knapweed or panicled knapweed, is a species of Centaurea native to eastern Europe. Spotted & Diffuse Knapweed. See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands Spotted & Diffuse Knapweed Centaurea biebersteinii, Centaurea diffusa. Rosettes are formed the first year and appear in early spring as deeply lobed leaves radiating from a common Seeds have short bristles (pappus) on one end. NUTRIENT VALUE The rosettes and young flowers of spotted knapweed have some nutritive value. Spotted Knapweed Centaurea stoebe L. ssp.

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