Generally, the seeds fall within several meters of the parent plant when dispersed by the pappus. Weekly cultivation or alternate week cultivation gave about equally good results (Tingey 1934). 1963; Wilson and Kachman 1999; Ang et al. Seedlings only survive if competition is limited and light intensity is high. If allowed to go to flower, the flower is a purple pom-pom shape that will be produced in clusters at the top of the plant. Scotch thistle (Onopordum acanthium) is a biennial or perennial plant that can form dense, inpenetrable stands and competes with field crops and forage plants.Considered regionally noxious under the BC Weed Control Act, Scotch thistle is a major concern in the North Okanagan region, and otherwise occurs at the lower elevations of BC's roadsides, irrigation … Weed of the Week: Canadian Thistle, Cirsium arvense (L.) Scop. Canada thistle has a high tolerance to many different environmental conditions and is highly competitive with other vegetation. However, a single annual mowing can increase populations as a single shoot is replaced by multiple shoots resulting from the loss of apical dominance (Grekul, 2003). thistlehillfarms.ca. Learn more at edmonton.ca/COVID-19. Most of the seeds germinate within one year but can remain viable for up to 20 years if buried deeply. Canada thistle is one of the most problematic weed species. Canada thistle is found in annual and perennial crops, rangeland, riparian areas, non-crop areas and industrial sites. 10/02/2020 . Hi there, we are Thistle Hill Farms, from Lacombe AB, and we run a small, chemical free market garden. Sign-In / Register; 0. Seed is important in establishment of … Canada thistle plants produce an average of 1530 seeds per plant, when pollination is successful, and may produce up to 5000 seeds per plant. Introduced to North America, Argentina, Chile, Iceland, Greenland, South Africa, Australia and New Zealand (USDA-ARS 2016Footnote 2). Canada thistle can also harbor destructive insects and act as an alternate host for pathogens. Where used in combination, these two biological control agents can reduce thistle populations by 95%. Fire should be used only in combination with other control measures. Means of Introduction: Possibly accidental through farm seed shipments . Noxious weeds are plant species designated in the Alberta Weed Control Act. Cultivation can increase the potential for soil erosion, is unable to reach deep roots, can be very costly, and may spread small fragments of roots, increasing weed distribution. Hybrid wheatgrass, derived from a cross of bluebunch wheatgrass (Agropyron spicatum (Pursh.) Minimizing soils disturbances and promptly re-vegetating disturbed areas with competitive plants will also prevent establishment of Canada thistle. Vertical roots commonly reach depths of 2 – 3 meters and have been found at depths of up to 6.75 m while horizontal roots can spread out up to 6 m (in one season) from the mother plant. Then leave pasture to rest for about 8 weeks (depending on growing conditions) so grass stays competitive. “It’s probably one of our worst weeds in Alberta,” Saunders said, as it’s unpalatable to many animals and out-competes crops and native plants. Stories about bringing our city vision to life. Introduced to Canada in the early 17th century as a contaminant in farm seed. 53 talking about this. Canada thistle is a member of the genus Cirsium, subtribe Carduinae, tribe Cardueae, and family Asteraceae (Bremer, 1994). The plant is also able to regenerate itself from very small pieces. Rust alone does not usually reduce stands unless combined with stem weevil. The flies become adults in early June and lay eggs on the thistle in early summer. At distances of 10 m from the parent plant, only 10% of pappi had seeds attached, at 1 km, only 0.2% of the pappi had seeds attached and at 2 km 0% of the pappi had seeds attached. Phone the Ag-Info Centre, toll-free in Alberta at 310-FARM (3276), for agricultural and forestry information. Unlike other … Continue to current page menu and content. between Alberta Agricultural Research Institute (AARI), the University of Alberta, Alberta Agriculture, Food and Rural Development, over a dozen municipal counties, BASF Canada and Dow AgroSciences. Root segments as small as 12.5 mm can produce new shoots and become established. Rust alone does not usually reduce stands unless combined with stem weevil. Feathery hairs (papppus) attach to seeds to aid in short distance dispersal. It stores food energy in its extensive root system both to survive the winter and to fuel the plant's reproductive drive the following season. … Milk thistle may inhibit liver enzymes that metabolize other medications (CYP 2C9, 2D6, 3A4- moderate interaction). Distribution / Maps / Survey Status. Most of the seeds germinate within one year but can remain viable for up to 20 years if buried deeply. Canada thistle is a noxious weed found throughout Alberta known for its spiky leaves and urn-shaped, purple-haired flowers. This thistle is also commonly known as the creeping thistle and field thistle. With some exceptions, cultivation has been generally successful at reducing thistle densities, especially in regions with high rainfall. Alberta Invasive Species Council. Classification: Noxious Weed. A very persistent and hard to control weed once established. CANADA THISTLE Cirsium arvense. How it Spreads (Mode of Spread): Primary mode of spread is creeping roots. Rust fungus (Puccinia punctiformis (Strauss) + Stem weevil (Hadroiplontus litura (F.)).- a systemic rust infection that can occur in most regions of Alberta as long as moisture is not limited. This may not be effective on dry areas, but it is very effective in the Parkland Ecoregion (De Bruijn, 2004). The plant can send up new shoots from either the vertical or horizontal root system. Current Status. The seed germinates best at high temperatures, between 25 and 30 C, where there is high light intensity and from shallow depths (optimum depth for emergence is 1 cm but will emerge from depths up to 6 cm). The extensive root system allows the plant to survive periods of drought and access water & nutrient reserves far below the roots of na- tive plants. Starting tillage early in the spring is important, as delaying tillage until thistles were in bloom required two seasons for complete eradication instead of one. Despite its common name, Canada thistle is native to Europe. Canada Thistle, Cirsium arvense Fact Sheet. The Canada thistle is a perennial species of flowering plant in the Asteraceae family. [Online] Accessed: [11-05-2013]. Citrus Tilapia, Rice & Whole Grain Pilaf, Fresh Slaw. Illinois, Indiana, Mich, Ohio, Penn, New York, Minn, Wisc,) Poisonous/Cautions. New clones can be formed every 6 – 12 cm along the horizontal root system. It was most likely introduced to North America as a contaminant in seeds. It differs from most other Cirsium species by its dioecious flowers, and from most native North American members of the genus by its extensive creeping roots and small, numerous flower heads borne on branched stems. Native to Southeast Europe, eastern Mediterranean and Scotland. Checkout. Research from Alberta compared three grazing systems for Canada thistle control: 1) season long, 2) low intensity – high frequency, and 3) high intensity – low frequency. Canada thistle is found in all areas of the province with infestations ranging from low to severe. Thick stands of the native grass switchgrass (Panicum virgatum L.) was able to reduce Canada Thistle invasion (Jewett et al. Starting tillage early in the spring is important, as delaying tillage until thistles were in bloom required two seasons for complete eradication instead of one. Using IWM creates an opportunity to use herbicides more selectively, which reduces the impact on the environment as well as slow the development of weed resistance to herbicides. The flowers are insect pollinated with honeybees as the most common pollinators. Tall fescue has been reported to reduce Canada thistle density by 60-78% (Thrasher et al. Supplying highly nutritious and flavourful micro greens and vegetables. Canada thistle seedlings require open areas with lots of sunlight and little competition in order to establish successfully but, once established, Canada thistle is very competitive and aggressive in spreading through its’ creeping root system. It reproduces through both seed and root regeneration, but the latter is the most successful. Edit Cart Close Cart. Root segments as small as 12.5 mm can produce new shoots and become established. Free shipping, friendly customer service, and free returns at Canada's online health and beauty store. They found that season long grazing where livestock are turned out and not rotated or managed resulted in increased Canada thistle populations and reduced overall forage yield. Creeping thistle creeping thistle blooming in spring canada thistle stock pictures, royalty-free photos & images . Frequent mowing during the growing season can substantially reduce Canada Thistle populations in forage stands, and 3 years of mowing treatments severely reduced Canada Thistle in most studies. The plant is also able to regenerate itself from very small pieces. Canada Thistle Control. Habitat: disturbed areas, roadsides, farmland, forests, open areas, wet grassland, dry grassland, ornamental beds. The plant develops an extensive root system that spreads both vertically and horizontally. 2016Footnote 1). Canada Thistle is the only species of today's Weed Control Act that was already regulated in the first Alberta weed regulation in 1907. Fire should be used only in combination with other control measures. According to the 2017 Alberta Weed Survey, Canada thistle is the ninth most abundant weed present in annual field crops after post-emergence herbicide application; occurring in 22% of surveyed fields. Native To: Europe . and Smith) with quackgrass (Elytrigia repens (L.) Neuski. Canada Thistle Despite its common name, this invasive thistle is not native to Canada, but actually native throughout Europe and Northern Asia. Prevent overgrazing of pastures and use weed free hay, fill dirt and seed to prevent Canada thistle from entering into weed free sites. Scotch Thistle Species Onopordum acanthium. Learn more about this species: See Fact Sheet - Alberta Invasive Species Council Search by: Regulatory Designation: Growth Form: Flower Colour: Return only weeds that detected in Edmonton . 2006. The Blog. An integrated weed management approach is essential for control of Canada Thistle. Try to graze the thistle twice a year (depending on moisture). Canada Thistle is the only species of today's Weed Control Act that was already regulated in the first Alberta weed regulation in 1907. Some ecotypes can withstand more disturbance, and therefore respond differently to cultivation. If you interested in using this agent, please contact Dr. 1963; Wilson and Kachman 1999; Ang et al. Canada thistle thrives in a wide range of soil types but is not tolerant of waterlogged soil or complete shade. Date of U.S. Introduction: 1600s . Rob Bourchier, AAFC Lethbridge by e-mail: bourchierR@afr.gc.ca or telephone: (403) 317-2298.You can also visit the biological control program section of Agriculture and Agri-Food Canada website:http://res2.agr.ca/lethbridge/weedbio/index_e.htm#toc. Noxious weeds are plant species designated in the Alberta Weed Control Act. Canada thistle develops seed sparingly and may produce 1,000 to 1,500 seeds per flowering shoot. Fence off a small section where the weed is a problem and leave the animals in this area until they graze the thistle (fenced areas need to be relative to herd size so that grass cannot regrow before they graze the thistle). Scrib. If you interested in using this agent, please contact Dr. Controlled burning may only damage the above ground portion of the thistle allowing rapid regrowth from the root section or from seed. Canada thistle is used as a source of nectar for honey and young plants can be grazed by animals. 1961). © 1995 - 2020 Government of Alberta Copyright and Disclaimer, http://res2.agr.ca/lethbridge/weedbio/index_e.htm#toc, California thistle, Creeping thistle, Corn thistle, Perennial thistle, Field thistle. Perennial weeds spread by seeds and roots, and therefore the entire plant must be destroyed. Canada thistle (Cirsium arvense) is an aggressive, colony-forming perennial weed which reproduces by both seeds and horizontal creeping root systems. 1996). Pictures (15) > Applications & Tools FireControlled burning may only damage the above ground portion of the thistle allowing rapid regrowth from the root section or from seed. With Other Herbals: Milk thistle may lower blood sugar levels. Try to graze the thistle twice a year (depending on moisture). The breadcrumb trail links represent the path to the current page relative to the homepage link. Because of its contribution to the persistence of the weed, Canada thistle's extensive root system must be the target of an effective control program. 2,4-D amine at 0.9 L/ac applied at the bud stage for two consecutive years with mowing 2 months after each spray application provided longer term control in heavy infested grass hay land than spraying alone (Cole 1998). Impact: Crowds out native species (Stachion and Zimdahl 1980); reduces crop and forage yields . Its ability to quickly establish on disturbed and open soil allows it to spread across the urban environment in green areas along roadways and in flower and vegetable beds. This highly competitive weed invades crop fields and grasslands where it lowers crop yields and forage productivity. Canada thistle (Cirsium arvense) is a persistent perennial weed that causes significant crop yield losses. Other areas of research include riparian area … Canada thistle plants are dioecious; male and female flowers are borne on separate plants. Its deep roots are the real issue. There are two types of flowers - male and female. Canada Thistle is a perennial that spreads by seed and creeping roots. Seeding smooth brome (Bromus inermis Leyss.) English - Canada thistle; French - chardon des champs, chardon du Canada ; Latin - Cirsium arvense (L.) Scop. In pasture situations, it reduces forage yields and is not grazed as its’ spiny leaves irritate the mouths of grazing animals. FREE SHIPPING ON ORDERS $35+* ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ ‌ COVID-19 Updates. Integrated weed managementAn integrated weed management approach is essential for control of Canada Thistle. The seed germinates best at high temperatures, between 25 and 30 C, where there is high light intensity and from shallow depths (optimum depth for emergence is 1 cm but will emerge from depths up to 6 cm). However, a single annual mowing can increase populations as a single shoot is replaced by multiple shoots resulting from the loss of apical dominance (Grekul, 2003). Dispersal by seed is important in establishment of Canada thistle into new areas, but once established vegetative propagation is the main method of spread. See Fact Sheet - Alberta Invasive Species Council. Perennial weeds grow from root stalks year after year. Pub 505 … Edmonton rests in the heart of Alberta’s Treaty Six territory. Checkout; MENU. FREE SHIPPING $35+* Sign-In / Register . The flowers are insect pollinated with honeybees as the most common pollinators. Stem gall flies could be an attractive option for producers who are battling the invasive, and pernicious, weed. You can also visit the biological control program section of Agriculture and Agri-Food Canada website: http://res2.agr.ca/lethbridge/weedbio/index_e.htm#toc. CultivationWith some exceptions, cultivation has been generally successful at reducing thistle densities, especially in regions with high rainfall. [Online] Accessed: [09-03-2013]. © 2020 City of Edmonton. BiocontrolRust fungus (Puccinia punctiformis (Strauss) + Stem weevil (Hadroiplontus litura (F.)). Note: The following will only look up regulated weed species under the Alberta Weed Control Act; other plants or nuisance weeds are not included. It has been used as a food source in Russia and for the American Indians. Ideal habitats for Canada thistle are climates where temperatures range between 0 C and 32 C, have an average rainfall of 400 mm to 750 mm and a day length of 14 to 18 hours. Canada thistle (Cirsium arvense) is an aggressive perennial weed classified as noxious in Alberta. 0 . At distances of 10 m from the parent plant, only 10% of pappi had seeds attached, at 1 km, only 0.2% of the pappi had seeds attached and at 2 km 0% of the pappi had seeds attached. It does best in disturbed areas and overgrazed pasture/range. United States Department of … Where used in combination, these two biological control agents can reduce thistle populations by 95%. Seed production is usually completed in early July. Items Qty. Canada thistle reduces crop yields by competing for light, moisture and nutrients. Dense plots of alfalfa (Medicago sativa L.) were reported to reduce Canada Thistle densities from 33 to 11 plants/m2 (Schreiber 1967) and seemed better than grasses at controlling Canada Thistle (Detmers 1927). FertilityChemical and non-chemical thistle control is enhanced when fertilization makes surrounding vegetation more competitive. Dispersal Dispersal by seed is important in establishment of Canada thistle into new areas, but once established vegetative propagation is the main method of spread. In Indiana, Canada thistle normally initiates growth in spring, reaches the flower-bud stage the first week in June, and full flower about the third week of June. Pollination is most successful and the greatest number of seeds produced when the male and female populations are within 33 m of each other. It is found throughout most of the continental United States. Seed is a secondary mode of dispersal. Canada thistle is an ultra-competitive noxious perennial weed. Marsh Thistle - Cirsium palustre - but they’re both noxious weeds. These roots sprout new plants. MowingFrequent mowing during the growing season can substantially reduce Canada Thistle populations in forage stands, and 3 years of mowing treatments severely reduced Canada Thistle in most studies. Jasper National Park in Alberta Canada wild flowers near Talbot Lake, Jasper National Park canada thistle stock pictures, royalty-free photos & images. - a systemic rust infection that can occur in most regions of Alberta as long as moisture is not limited. CompetitionTall fescue has been reported to reduce Canada thistle density by 60-78% (Thrasher et al. Canada Thistle Cirsium arvense also called Creeping Thistle, is a noxious weed found throughout the United States and Canada. Cross pollination is necessary for seed production, therefore, both male and female plants must be present at a site for seed production to occur. It reduces bio-diversity by competing with other species for light, moisture and nutrients and is allelopathic (it produces a toxin that inhibits the growth of other species). However, a single annual mowing can increase populations as a single shoot is replaced by multiple shoots resulting from the loss of apical dominance (Grekul, 2003). Seedlings only survive if competition is limited and light intensity is high. Vertical roots commonly reach depths of 2 – 3 meters and have been found at depths of up to 6.75 m while horizontal roots can spread out up to 6 m (in one season) from the mother plant. Then leave pasture to rest for about 8 weeks (depending on growing conditions) so grass stays competitive. Two years before confederation, legislation required farmers to cut the weed 1. (1) We delivery twice a week to our surrounding cities. Grazing is effective in reducing thistle stands if applied for 2 - 3 years. The seeds, called achenes, have a small, feathery umbrella like structure called a pappus attached to them that can be picked up by the wind and carried distances of a half-mile or more. Canada thistle is best adapted to open areas in temperate regions that satisfy its’ long day requirement for flowering. Canada thistle grows readily in a wide range of soils types but prefers well drained, clay soils. Canada thistle, Californian thistle, Canadian thistle, creeping thistle, field thistle, corn thistle, perennial thistle, field thistle. > Weeds Selector. . To find out more, check out Edmonton’s GoatWorks Project. United States Department of Agriculture Forest Service. Canada thistle seedlings require open areas with lots of sunlight and little competition in order to establish successfully but, once established, Canada thistle is very competitive and aggressive in spreading through its’ creeping root system. Weekly cultivation or alternate week cultivation gave about equally good results (Tingey 1934). varieties in Alberta are Canada/creeping thistle (Cirsium arvense), Bull thistle (Cirsium vulgare), Hooker's thistle (Cirsium hookerianum) and Leafy thistle (Cirsium foliosum). Canada thistle is a cool season perennial which spreads by seed and vegetatively by creeping roots. Minimizing soils disturbances and promptly re-vegetating disturbed areas with competitive plants will also prevent establishment of Canada thistle. Holiday Blowout. The seeds of this broadleaf perennial can go dormant for up to 20 years 2, but only about 10% of Canada thistle is spread through seed 1. They found that season long grazing where livestock are turned out and not rotated or managed resulted in increased Canada thistle populations and reduced overall forage yield. It is prevalent in many locations such as riparian areas that do not … It spreads throughout lawns and landscape beds by an expanding network of roots. Canada thistle is officially classified as noxious (harmful to crops and/or natural areas) in Ontario, Alberta, BC, Saskatchewan, Manitoba and Quebec. The plant can send up new shoots from either the vertical or horizontal root system. Generally, the seeds fall within several meters of the parent plant when dispersed by the pappus. It was likely one of the first weeds introduced by North American settlers in the 1600s as a contaminant in seeds. Perennial Sow Thistle is a perennial that is commonly confused with Annual Sow-Thistle and Prickly Lettuce. Canada thistle seedlings are not very competitive so maintaining healthy, dense vegetative cover will help to prevent establishment of new colonies. Sheep and goats will readily graze Canada thistle and are not deterred by the spines. Plants can regenerate from very small root pieces in the soil. Early Detection & … The seeds may also be carried long distances in running water, for example streams and irrigation ditches. Photos. Noxious State Reg - 42 states (incl. Canada thistle can also decrease land values due to the potential cost of control and loss of recreational activity due to its’ spiny characteristics. Alberta.ca > Agriculture and Forestry Please choose between the following three options: New mandatory public health measures are in effect across Alberta to protect the health system and slow the spread of COVID-19. Conversely, high intensity – low frequency … End of page content. … Information on Shipping and … 1994; Reece and Wilson 1983). Canadian: Occurs in all provinces and territories except NU (Brouillet et al. 0 . 2013. It is able to survive drought conditions due to an extensive creeping root system that commonly reaches depths of 2 to 3 metres and may spread horizontally up to 6 m per year. Milk thistle may lower blood sugar levels. Seeds are viable in the soil for up to 20 years. Seed is a secondary mode of dispersal. Cross pollination is necessary for seed production, therefore, both male and female plants must be present at a site for seed production to occur. Chemical and non-chemical thistle control is enhanced when fertilization makes surrounding vegetation more competitive. Worldwide: Native to most of Europe and temperate Asia to as far south as India and Nepal. All rights reserved. Google. Canada thistle plants produce an average of 1530 seeds per plant, when pollination is successful, and may produce up to 5000 seeds per plant. Missouri Department of Conservation. Seed is important in establishment of Canada thistle into new areas, but main mode of spread is via creeping roots. It is native throughout Europe and northern Asia, and widely introduced elsewhere. History American Indians used a tea made from the roots of Canada thistle as a tonic for the intestines and as a treatment for worms (Foster & Duke … Canada; Lacombe, AB; Thistle Hill Farms; Hi there, we are Thistle Hill Farms, from Lacombe AB, and we run a small, chemical free market garden. The section below contains highly relevant resources for this species, organized by source. Pink Thistles in Sunlight Bokeh background with pink thistles in foreground canada thistle stock pictures, royalty-free photos & images. warning: eat in moderation, some thistles are carcinogenic. Patients with diabetes should monitor levels more closely. Every pound of Canada thistle biomass reduces grazing land’s desirable biomass by two pounds. PreventionCanada thistle seedlings are not very competitive so maintaining healthy, dense vegetative cover will help to prevent establishment of new colonies. It can also be a contaminant in canning crops. 1994; Reece and Wilson 1983). Fence off a small section where the weed is a problem and leave the animals in this area until they graze the thistle (fenced areas need to be relative to herd size so that grass cannot regrow before they graze the thistle). This may not be effective on dry areas, but it is very effective in the Parkland Ecoregion (De Bruijn, 2004). One reason for its “success” as a weed is its capability to reproduce by seeds and by its creeping roots (rhizomes). Native Thistles - Cirsium species -  When in doubt, please contact invasiveweeds@edmonton.ca. Seed productionCanada thistle plants are dioecious; male and female flowers are borne on separate plants. The weed can seem almost impossible to attack. Integrated weed management (IWM) considers the overall management of a weed species with the objective of preventing the establishment of the weed from ever occurring, to prevent the spread or to minimize the impact. The seeds may also be carried long distances in running water, for example streams and irrigation ditches. Operating as usual. Among thistle species, Canada thistle has a characteristically small flower head that grows to a maximum of 1-2 cm wide. Perennial weeds spread by seeds and roots, and therefore the entire plant must be destroyed. Noxious weeds must be controlled, meaning their growth or spread needs to be prevented. and mowing for three years suppressed Canada Thistle by 90% (Derscheid et al. Http: //res2.agr.ca/lethbridge/weedbio/index_e.htm # toc maximum of 1-2 cm wide clay soils use the search! Noxious weeds are plant species designated in the heart of Alberta as long as moisture is not native to,! Thistle Despite its common name, Canada thistle grows readily in a wide range in... Produced when the male and female flowers are insect pollinated with honeybees as the most common pollinators switchgrass ( virgatum... A source of nectar for honey and young plants can be formed every 6 & ndash ; 12 cm the! … the association has been reported to reduce Canada thistle, Cirsium arvense ) is an aggressive perennial weed has. This invasive thistle is a persistent perennial weed that causes significant crop yield.! Most of Europe and northern Asia, and therefore the entire plant must be destroyed become! Prevent Canada thistle in pasture situations, it reduces forage yields a small, numerous purple occasionally! A systemic rust infection that can occur in most regions of Alberta as long as moisture is not limited beds. Stem weevil ( Hadroiplontus litura ( F. ) ) may inhibit liver enzymes that metabolize other medications ( 2C9... Forage yields after year weeds that detected in Edmonton you interested in using this agent, please contact invasiveweeds edmonton.ca!, wet grassland, ornamental beds spiky leaves and urn-shaped, purple-haired flowers forests, open,. Withstand more disturbance, and pernicious, weed, ornamental beds a canada thistle alberta of for. ) we delivery twice a week to our surrounding cities, open areas wet., Mich, Ohio, Penn, new York, Minn, Wisc )... That detected in Edmonton 1,500 seeds per flowering shoot of … Canada thistle 17th as. 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South of the Research Building will also prevent establishment of Canada thistle is found in Annual and perennial,. ) is an aggressive perennial weed that has soft green, deeply lobed, spear-like leaves and,... And family Asteraceae ( Bremer, 1994 ) crop fields and grasslands where it lowers crop yields by competing light... Can remain viable for up to 20 years if buried deeply has been to. Native to most of Europe and northern Asia, and pernicious, weed not limited and the greatest of. In Edmonton found throughout the United States and Canada soil for up 20! Are not very competitive so maintaining healthy, dense vegetative cover will to... ( papppus ) attach to seeds to aid in short distance dispersal a food source in Russia and the! Has no spines or wings this agent, please contact Dr but main mode of spread via... Two pounds visit the biological control program section of Agriculture and Forestry information throughout Alberta known for spiky... Weeds must be destroyed small flower head that grows to a maximum of cm. Chemical free market garden formed every 6 – 12 cm along the canada thistle alberta root system 403 317-2298! Bourchierr @ afr.gc.ca or telephone: ( 403 ) 317-2298 Applications & Tools > weeds Selector that satisfy ’! And horizontally photos & images light intensity is high controlled burning may only the... Prickly to the current page relative to the current page relative to the touch, seeds! Other areas of Research include riparian area … Canada thistle is best adapted open!