• Any of several perennial composite plants , especially of genera Cirsium , Carduus , Cynara , or Onopordum , having prickly leaves and showy flower heads with prickly bracts . (wiktionary.org)
  • St. Johns Wort, bull thistle (Cirsium vulgare) , hounds tongue (Cynoglossum officinale) , common burdock (Arctium minus) , and common tansy (Tanecetum vulgare) were observed along 116.4 miles of road. (nezperceswcd.org)
  • Sadly, Cirsium discolor has been targeted for eradication largely due to the invasive behavior of its non-native cousins, the European Bull Thistle ( Cirsium vulgare ) and Canada Thistle ( Cirsium arvense ) which, despite the name, is not native to North America. (floydnativeplants.org)
  • Cirsium vulgare (Savi) Ten. (gardenorganic.org.uk)
  • One of the worst invasive pests here is Cirsium vulgare or Bull Thistle. (nargs.org)
  • 3. Common Thistle/Spear Thistle/Bull Thistle (Cirsium vulgare). (farmfoodfamily.com)
  • Creeping thistle is native to Europe and Asia and was introduced to North America in the 1600s. (herokuapp.com)
  • Creeping thistle is a herbaceous perennial plant growing up to 150 cm, forming extensive clonal colonies from thickened roots that send up numerous erect shoots during the growing season. (naaiatelier-elena.nl)
  • The standard English name in its native area is creeping thistle. (naaiatelier-elena.nl)
  • Canada thistle (Creeping thistle, California thistle, Cursed thistle) is a shiny green, spiny thistle native to Europe, Western Asia, and Northern Africa. (cloudwaysapps.com)
  • In the U.K. the adults become active in the spring when the hosts begin to grow, these include various thistles but here it is mostly Cirsium arvense (L.), creeping thistle, and only occasionally other species. (ukbeetles.co.uk)
  • Unlike creeping thistle ( C. arvense ), the feathery pappus remains attached firmly to the seed as an aid to wind dispersal. (gardenorganic.org.uk)
  • 2. Canada Thistle or Creeping Thistle (Cirsium arvense). (farmfoodfamily.com)
  • Canada thistle is a rhizomatous, perennial, herbaceous plant. (naaiatelier-elena.nl)
  • Canada Thistle · Cirsium arvense (L.) · is a colony-forming perennial. (cichosting.com)
  • Spear thistle is a robust biennial or short-lived monocarpic perennial that can be a serious problem in grassland and waste and cultivated ground throughout the UK. (gardenorganic.org.uk)
  • Information on habit, biology, persistence & spread for Spear thistle. (gardenorganic.org.uk)
  • Spear thistle flowers in June and July but rosettes can survive for up to 4 years without flowering. (gardenorganic.org.uk)
  • Spear thistle seedlings may emerge in spring and autumn but the main period of emergence is March to April. (gardenorganic.org.uk)
  • Spear thistle does appear to accumulate a persistent seedbank and seedlings may only emerge after fresh seed has been shed. (gardenorganic.org.uk)
  • Disturbance of the soil and vegetation has been shown to advance the germination of spear thistle. (gardenorganic.org.uk)
  • Spear thistle rosettes grow better in grazed than ungrazed pasture because of reduced competition from neighbouring plants. (gardenorganic.org.uk)
  • Spear thistle spreads only by seed. (gardenorganic.org.uk)
  • Spear thistle reproduces only by seed and it is important to prevent fresh seeding. (gardenorganic.org.uk)
  • In arable crops, spear thistle seedlings are destroyed by surface cultivations in spring, and by hoeing or spudding as necessary. (gardenorganic.org.uk)
  • Spear thistle can be pulled out when in flower, or the taproot may be cut below ground when plants are at the rosette stage using a thistle hoe. (gardenorganic.org.uk)
  • Canada thistle, yellowstar thistle (Centaurea solstitialis) , and spotted knapweed (Centaurea maculosa) were the three species observed and classified in the reduce group. (nezperceswcd.org)
  • Just did some armchair botanizing to look as a few more of the fantastic sea urchin dwarf thistles, even Centaurea comes to mind. (nargs.org)
  • Canada thistle is commonly found growing on roadsides, cultivated fields, pastures, logged forests, riverbanks, and other disturbed areas where it also out-grows native species. (cloudwaysapps.com)
  • A member of the sunflower family, orange hawkweed is native to central and southern Europe and grows in open areas like roadsides, meadows, pastures, hayfields, and disturbed sites. (conservationdistrict.org)
  • Prolific in pastures, clear cuts, and disturbed roadside areas, tansy populations can become quite dense. (conservationdistrict.org)
  • Across the state of Virginia, it can be found in "floodplain forests, mesic to dry upland forests and woodlands, clearings, old fields, meadows, and roadsides" ( Digital Atlas of the Virginia Flora ). (floydnativeplants.org)
  • Poison hemlock (Conium Maculatum) , scotch thistle (Onopordum acanthium) , and hybrid knotweed (Polygonum bohemicum) were the three species observed from the contain group. (nezperceswcd.org)
  • Scotch thistle ( Onopordum acanthium et al. (wiktionary.org)
  • All are associated with various species of thistles, Asteraceae, Carduae. (ukbeetles.co.uk)
  • It targets specific weed problems like Canada thistle, musk thistle, and giant ragweed. (storycountyiowa.gov)
  • Canada thistle is a shiny green, spiny plant that can grow from 0.3-2.0 m tall. (cloudwaysapps.com)
  • There are so many species from such a lot of genera that I thought I'd start a board that was more general - Panayoti and others have been rapping on spiny plants on the Cactus discussions and I love pricklies (although Monica doesn't so I have to keep them out of touch with one another) but above all I think thistles of all sorts are the great gems. (nargs.org)
  • arvense has merely toothed or shallowly lobed, weakly spiny lvs. (asu.edu)
  • Bull Thistle is a spiny and common purple wildflower in Vermont. (birdwatchinghq.com)
  • open woodland, unmanaged grassland, roadsides and wasteland etc., adults may be sampled by sweeping or beating likely host plants but they rarely occur in any numbers. (ukbeetles.co.uk)
  • Canada thistle is a designated noxious weed under the Nebraska Department of Agriculture's Noxious Weed Program. (naaiatelier-elena.nl)
  • It … Here is the Canada Thistle, Cirsium arvense, a herbaceous plant that is very thorny and is considered a Noxious Weed. (naaiatelier-elena.nl)
  • Canada thistle is designated as a Provincial Noxious Weed by the BC Weed Control Act. (cloudwaysapps.com)
  • Canada thistle is now listed as a noxious weed in most areas where it occurs. (asu.edu)
  • Historically invasive species have always been a problem in the roadside, but the county Weed Commissioner oversees the control of noxious weeds on all public and private property.Controlling noxious weeds is an important aspect of responsible land management. (storycountyiowa.gov)
  • Download the Invasive Species Council of BC's Factsheet for Canada Thistle here. (naaiatelier-elena.nl)
  • Nebraska Extension Publications has a number of publications on thistle management and other invasive species. (naaiatelier-elena.nl)
  • Invasive Species, 2270 Old Penitentiary Road, Boise, ID, 83712, United States It is a non-native invasive species from Europe, and landowners with Canada thistle on their property are obligated to take measures to control it. (naaiatelier-elena.nl)
  • Its flowers are typically smaller than other thistle species. (cloudwaysapps.com)
  • Cirsium discolor can be grown in most any sunny mesic cultivated garden, though it is a widely adapted pioneer species able to scrape out a living in many disturbed or subxeric habitats. (floydnativeplants.org)
  • Cirsium discolor is noted of Special Value to Native Bees by the Xerces Society ( Wildflower.org ), as a keystone species for 15 species of native bees by Dr. Doug Tallamy, and as a provider of nesting habitat for some native bees including leaf miner bees which nest in the hollow stems ( Xerces , 2017). (floydnativeplants.org)
  • Among the worst invasive species that are present at Hidden Springs wetlands are purple loosestrife ( Lythrum salicaria ), mis-named Canada thistle ( Cirsium arvense ), and reed canarygrass ( Phalaris arundinacea ). (boisefrontnature.com)
  • Each thistle plant can produce 1,000 up to 1,500 seeds per shoot. (naaiatelier-elena.nl)
  • Canada Thistle reproduces by seeds and roots. (cichosting.com)
  • Fewer than 10 seedlings are likely to develop from the seeds shed by an individual thistle plant. (gardenorganic.org.uk)
  • The seeds of this thistle are the preferred menu item for the American Goldfinch. (birdwatchinghq.com)
  • There's a good reason Canada thistle has a reputation as a highly invasive, aggressive spreader. (naaiatelier-elena.nl)
  • The introduced Canada thistle, Matt pointed out, can choke out all sorts of native vegetation as well as native thistles. (naaiatelier-elena.nl)
  • Currently several weevils and a gall fly have been released to target Canada thistle. (naaiatelier-elena.nl)
  • These biological control measures will not completely manage / control Canada thistle alone, but are an IMP tool and help suppress growth. (naaiatelier-elena.nl)
  • Unlike the many native thistles found in Oregon, Canada thistle can quickly overrun an area and displace native plants, reduce agricultural yield, and create problems for … Once Canada thistle has invaded, it is very important to maintain soil fertility and moisture at optimum levels to favor crop or pasture plant establishment and growth. (naaiatelier-elena.nl)
  • Canada thistle (Cirsium arvense) and St Johns Wort (Hypericum perforatum) were widely distributed, being observed along 144.6 and 105.0 linear miles of road segments. (nezperceswcd.org)
  • A mature Canada Thistle plant is 2 to 5 feet tall, branching at the top. (cichosting.com)
  • Methods of Control Timely herbicide application is the best method to control Canada Thistle. (cichosting.com)
  • Canada thistle (Cirsium arvense) is a widespread invasive weed found in all parts of Clackamas County. (conservationdistrict.org)
  • Unlike the many native thistles found in Oregon, Canada thistle can quickly overrun an area and displace native plants, reduce agricultural yield, and create problems for grazing animals when they infest a field or pasture. (conservationdistrict.org)
  • Large patches of purple-flowered Canada thistle ( Cirsium arvense ) grow at the edge of the marsh, interspersed with tall stalks of poison-hemlock ( Conium maculatum ) covered with small white flowers. (boisefrontnature.com)
  • Canada thistle can spread quickly, so early detection and removal is important. (farmfoodfamily.com)
  • To remove Canada thistle, first cut the plant down to ground level. (farmfoodfamily.com)
  • Canada thistle is a tough weed, but with persistence you can get rid of it! (farmfoodfamily.com)
  • This plant, while called Canada thistle, is actually a European farm weed. (nj.us)
  • Bur Ragweed occurs in moist places of fields, rangeland, and roadsides. (cichosting.com)
  • Native to central and western Europe, this fast-growing plant commonly invades sites such as parks, trails, roadsides, and streamsides. (conservationdistrict.org)
  • This is a non-native plant which is usually found in open areas where the ground has been disturbed, such as fields, roadsides, streamsides, gardens, and forest openings. (nj.us)
  • IRVM maintains a safe travel environment on the county right-of-ways, controls noxious weeds and soil erosion, sustains water quality, improves wildlife habitat, and provides the public with aesthetically pleasing roadsides. (storycountyiowa.gov)
  • Noxious weeds often invade and destroy the roadside turf grass, leaving these areas vulnerable to erosion. (lakercountry.com)
  • Cirsium arvense is one of the most economically important agricultural weeds in the world. (asu.edu)
  • Roadside verges and waste ground. (hmbg.org)
  • In addition, it occurs on broad roadside verges. (bwars.com)
  • Refer to Xerces Society's Native Thistles: A Conservation Practitioner's Guide for more information on cultivation. (floydnativeplants.org)
  • The Integrated Roadside Vegetation Management Program (IRVM) was developed to provide a cost-effective, environmentally safe management alternative to conventional chemical and mechanical management practices. (storycountyiowa.gov)
  • In the past, blanket spraying killed or stressed many plants in the roadside resulting in weedy vegetation and water quality issues. (storycountyiowa.gov)
  • Native thistles attract many butterflies (including the monarch butterfly) with their copious nectar. (floydnativeplants.org)
  • Iowa's native roadsides help prevent soil erosion and provide important habitat while promoting the use of prairie statewide. (storycountyiowa.gov)