Blue-green leaves and stems. Toothed and hairy base leaves; upper leaves small and narrow with a smooth edge. Russian knapweed (Acroptilon repens)Author: George Beck, Colorado State University Cooperative Extension Adapted from the Colorado State University Extension Natural Resources Fact Sheet " Russian Knapweed" Identification and Life Cycle. This site is also protected by an SSL (Secure Sockets Layer) certificate that’s been signed by the U.S. government. Floral bracts are broad, ovoid, entire, and greenish at the base with papery, finely hairy edges. Life Cycle. Control. MoNo Library. Impacts . It spreads by seeds and from shoots arising from creeping roots. Identification. The Plectocephalus group – possibly a distinct genus – … The MoNo, short for monoculture, Library is the innovation of Roots: Russian knapweed roots are easily recognizable by their black or dark brown color and small buds that develop into adventitious shoots, enabling the plant to spread rapidly and form dense colonies. More MoNo Library Plant Species Motion Clips MoNo: Dalmatian toadflax MoNo: leafy spurge MoNo: Russian knapweed MoNo: houndstongue MoNo: Canada thistle MoNo: sulfur cinquefoil MoNo: spotted knapweed. Alberta Invasive Species Council (Canada). The https:// means all transmitted data is encrypted — in other words, any information or browsing history that you provide is transmitted securely. Stems grow upright and are widely branched. Conservation Services Division. Extension Service. USDA. Russian knapweed (synonyms: Turestan thistle, creeping knapweed, mountain bluet, Russian cornflower, hardheads) is an introduced, long lived, creeping perennial. Whitson TD, 1999. Eggs laid in meristematic tissue are not visible under field conditions and adults may be difficult to see due to their size. Russian knapweed [Rhaponticum repens (L.) Hidalgo]. This invasive weed is the most widely distributed of the various knapweed species. Russian knapweed is a native of Eurasia, probably introduced to North America about 1898. This plant ranges from 0.5-1 m tall. In: Smith L, ed. Russian knapweed. It … Leaves on the lower portion of the stem are 2 to 4 inches long and deeply lobed, while upper leaves are smaller and less lobed with smooth margins. Knapweeds are highly competitive plants that can exclude more desirable plants and form large, dense infestations. Knapweed species are con-sidered noxious weeds. It also is the only perennial of the noxious knapweeds and is the most difficult to control. California Department of Food and Agriculture. Portions of roots, if broken off, may grow and form new plants. Identification and Reproduction Identificaion: Russian knapweed is a bushy perennial in the Asteraceae family. Life cycle/ other: Russian knapweed is a long-lived perennial spreading by creeping roots as well as seeds. Russian Knapweed is native to Eastern Europe and Asia and in the early 1900s it was introduced to North America as a contaminant in alfalfa seed. Russian knapweed displaces native vegetation and reduces forage values The section below contains highly relevant resources for this species, organized by source. Identification: Russian knapweed is a long-lived, deep-rooted perennial with growth characteristics similar to Canada thistle. Russian knapweed, plants - Photo by Norman E. Rees; USDA, Agricultural Research Service. This species is found on a variety of soil types, and has been noted to invade areas where it was not directly introduced (Watson 1980 Footnote 3). Flowering Time: June to October depending on species. Achene has shallow longitudinal ridges; Colour. Cultural control methods have not been developed at this time. Rapid response and eradication of these small infestations is critical to prevent the spread of this invasive weed. Visit the Resources tab for more information. 1. Russian knapweed can grow up to 3 feet in height. From the Oregon Department of Agriculture. University of Georgia. He then struggles to pull out a small green patch and notes that this is probably just one plant. Achene length: 2.5 - 4.0 mm; Achene width: 1.5 - 2.5 mm; Shape. See also: Included on California's noxious weed list; see. This was introduced … Russian Knapweed Author: K.G. Knapweed is a rather robust plant that can be found in dry, infertile soil, vacant lots, near railroad tracks, roadsides, coastlines and high lime or salt areas. He demonstrates that there is a vaguely hairy texture to the plant that you notice when you drag your fingers across it. By 3–8 cm long portions of roots, if broken off, may grow to 23 feet Deep,... 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