why is canada thistle bad

Canada thistle is an aggressively spreading perennial weed that has deep, creeping roots which make it difficult and time-consuming to remove. Thistles reduce the use of an area for grazing or recreational purposes because of the prominent spines on leaves, stalks, and blooms. “Threats: Canada thistle’s rapid growth aggressively competes with native plants and crops for nutrients, moisture and light. ECOLOGICAL THREAT: Natural communities that are threatened by Canada thistle include non-forested plant communities such as prairies, barrens, savannas, glades, sand dunes, fields and meadows that have been impacted by disturbance. Date of U.S. Introduction: 1600s . In fact, improper cultivation can even worsen Canada thistle problems!”, From Pennsylvania: In cropland, Canada thistle causes extensive yield losses through competition for light, nutrients, and moisture. Why is Canada thistle so tenacious? Ask yourself what weeds you can target where it will make the most difference. “Noxious weeds are difficult to control and injurious to public health, the environment, roads, crops, livestock and property. Its root system can be extensive, growing horizontally as much as 18 feet in one season (Nuzzo 1998). In some cases it may lead to cuts and sometimes infections — but it’s not toxic. Heavy infestations are also commonly found in overgrazed pastures and ranges and may crowd-out and replace native grasses and forbs, decreasing species diversity in an area. So, to go to Ray’s question about a cavalier attitude, my opinion is it varies just as widely as the state decision making process. It also increases harvesting problems due to seed and forage contamination. (* about $6500 of my annual salary and benefits comes from fulfilling Master Gardener responsibilities. Obviously the selection process varies widely from state to state. We (the people of this country) only have so much in the way of resources to combat invasive plants and noxious weeds, so we need to do our best to focus our efforts where it really matters. Basically the citations above point out that this stuff is a weed — which we already knew — I just don’t see this information raising Canadian thistle to the level of noxious weed. Canada thistle definition, an Old World plant, Cirsium arvense, having small purple or white flower heads, now a troublesome weed in North America. In gardens, flower beds, and lawns, Canada thistle’s extensive root system makes it a hassle to control. This is an interesting discussion but I’m very confused. About half the calls to Meyer’s office this month are from people reporting stands of musk thistle, a noxious weed. Books: http://www.sustainablelandscapesandgardens.com She also is one of the Garden Professors – a group of academic colleagues who educate and entertain through their blog and Facebook pages. Tall thistles, with silvery leaves, flower in August and September and are a good thistle. 1993). "The Garden Professors" Facebook page - www.facebook.com/TheGardenProfessors Even research can be suspect if, as Jeff points out, the thistle isn’t being compared with other weeds as opposed to pristine growing conditions. In 2018 Linda was featured in a video series – The Science of Gardening – produced by The Great Courses. Tall thistle is often found in drainage ditches and wetland areas and not in pastures. Most Canada thistle patches spread at a rate of 3-6 feet/year, crowding out more desirable species and creating thistle monocultures. Generally these good thistles attract butterflies, sometimes bees, and their seeds are eaten by songbirds. Biology. So what is the objective, neutral, criteria that qualifies one weed as noxious, and another not? Persistence is imperative so the weed is continually stressed, forcing it to exhaust root nutrient stores and eventually die.Canada thistle (Cir… When thistle starts sprouting in their yards, some determine to never use this feed again. Canada thistle invades natural areas such as prairies, savannas, open areas in forests, and dunes if some degree of disturbance already exists. So Meyer is hoping a little education will help people distinguish between good and bad thistles with pinkish-purple flowers. But it wasn’t musk thistle growing near the creek. “Canada thistle threatens productivity in both crop and non-croplands. There are the bad thistles -- the musk thistle, the plumeless thistle and the Canada thistle, all with purplish flowers -- which came from other countries without their natural predators to keep them in check. And that means many phone calls and people upset because they believe the county weed authority, the local natural resources district and the parks department aren’t doing their job. As it establishes itself in an area, Canada thistle crowds out and replaces native plants, changes the structure and species composition of natural plant communities and reduces plant and animal diversity. All biennial thistles considered noxious are native to Europe or Eurasia, and were introduced into North America as seed contaminants. This may be partially due to the extensive taproot in many broadleaf weeds that allow them to remain green longer into the dry season, thereby appearing potentially attractive to horses grazing in poor pastures. As mentioned earlier, they thrive in disturbed soils.) “Why is it a noxious weed? Musk thistles flower in May and June and don't have any silver on their leaves. Flowers are pink, bristly, 1/2 inch long and wide. Add livestock and dairy interests, and I think you’re tilting at windmills with your fellows on the committee. One reference points out that Canadian thistle is toxic to horses — that’s wrong. Canada thistle produces an abundance of bristly-plumed seeds which are easily dispersed by the wind. The wind-dispersed seeds may remain viable for 20 years or more, allowing it to spread quickly and making it difficult to eradicate.”. There was a problem saving your notification. “In alfalfa stands grown for seed production, Canada thistle can reduce yield by 48 percent. Serious problem should equal active efforts to limit the spread. It releases chemicals toxic to other plants. Advancing the science of gardening and other stuff since 2009. That said, Canadian thistle is listed because of political pressure (I do sit on the Minnesota Department of Agriculture’s committee which reviews these weeds). Most of the seeds germinate within a year, but some may remain viable in the soil for up to … It is also known as cursed thistle, probably due to the fact that chopping the roots with a plow effectively spreads the thistle across a field. And the difference can be confusing, particularly when they look so much alike. Similar plants: Stems of Canada thistle are not spiny in contrast to bull thistle (Cirsium vulgare) and nodding thistle (Carduus nutans). (Of course, the goldfinches would disagree with me!). Enjoy unlimited articles at one of our lowest prices ever. Email notifications are only sent once a day, and only if there are new matching items. Considered noxious under the BC Weed Control Act, Canada thistle is commonly found on roadsides, cultivated fields, pastures, logged forests, riverbanks, and other disturbed areas. They are a noxious weed. Of the 11 on the Minnesota list, can you rank them, and tell us why or why not they should be on there? There's a difference between a good thistle and a bad one. Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pocket (Opens in new window), The complicated issue of heavy metals in residential soils, part 2: How plant species and environmental variables complicate the issue, The worms crawl in and the worms crawl out but these worms kill your plants, Hydroponics for the Holidays? Hand-pulling and cultivation are often ineffective control mechanisms because new plants sprout from root pieces that snap off. How can one differentiate between fact and baseless opinion when no actual research is presented as is the case with the danger stated of thistle to pasture. A combination of mowing and herbicides is best, Eckberg said. Canada thistle or Canadian thistle, featured here, is native to Eurasia, where it is known as creeping thistle, due to its ability to spread via roots into dense patches. Grazing animals will not eat anywhere near where Canada Thistle grows, so if you own horses or cows, a bad infestation of Canada Thistle in your pastures can cause problems. Do not pull Canada thistle out, as this can split the root, which causes two Canada thistles to grow back. Note the running roots, which can persist and keep sprouting even through a year or two of frequent pulling or spraying with herbicide. Native To: Europe . 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. 2nd Cite for Pennsylvania: The reference from Montana points out that two thistles per square yard can have a significant effect on the growth of crops — I certainly believe that, but then many other weeds will do the same thing so I don’t see why that information should make this weed significantly worse than others. Others will disagree. Canada thistle (Cirsium arvense) is a perennial that has plagued farmers in America since European settlement, and is a Noxious Weed in Pennsylvania. So here’s Ray: Here is a brief summary of the results of a google search of .edu and .gov or .us sites on the subject of Canada thistle or Cirsium arvense as a noxious weed, examining the “whys” by a mostly volunteer* Master Gardener reliant on published literature by reputable sources and charged with fulfilling the Land Grant University charter to bring science based information to the local level. Canada Thistle Where Did it Come From? Both natural and human caused disturbances can create the opportunity for Canada thistle to become established in natural communities.”, Ohio: Combining control methods is the best form of Canada thistle management. It invades natural areas such as prairies and dunes that have disturbance. At the time I didn't even think to … On what basis should folks like you be more or less cavalier? A Monarch butterfly feeds on a native tall thistle. then {{format_dollars}}{{start_price}}{{format_cents}} per month. “By 1795, Vermont enacted noxious weed legislation against Canada thistle and, in the early 1900’s, the currently named Noxious Weed Act gave a person the right to eradicate this species wherever they found it without fear of trespassing. It actually came from Europe. Reach the writer at 402-473-7250 or nhicks@journalstar.com. Generally, infestations start on disturbed ground, including ditch banks, overgrazed pastures, tilled fields or abandoned sites. 2nd cite Colorado: Should you ignore the lists? But why is it so tough to get rid of Canada thistle and what is the best way to do so? This highly invasive thistle prevents the coexistence of other plant species through shading, competition for soil resources and possibly through the release of chemical toxins poisonous to other plants. Additionally, plants can spread by growing in circular … I make a distinction between noxious and invasive, first off. Bull thistles (Cirsium vulgare) are exactly that – bullish. Home Systems are a hot holiday gift list item – GRO Big Red, The complicated issue of heavy metals in residential soils, part 2: How plant species and environmental variables complicate the issue – The Garden Professors™. Wildflowers Of WisconsinWild… There are more, but I stopped on page 3 of the 120 page result of the google .edu search. While Canada thistle (not surprisingly) grows throughout much of Canada, this weed also thrives in most of the U.S., as well as Europe and Asia. ), From the Minnesota pdf referenced above: This time of year musk thistle is usually dried up and has fallen over, Meyer said. Canada Thistle is also a food source for the engrailed moth. But it is more of a bushy plant. The points from Invasive.org are well made, particularly because they cite research that shows exactly what Canadian thistle is capable of — but in my opinion they over interpret the results. Jimsonweed and poison ivy are native and on many state lists. She is WSU’s Extension Urban Horticulturist and an Associate Professor in the Department of Horticulture, and holds two affiliate associate professor positions at University of Washington. Nancy Hicks reports on Lincoln city government, but she’s been following the leaders of local and state government for more than 40 years. It also increases harvesting problems due to seed and forage contamination. The plant is beneficial for pollinators that rely on nectar. Tall thistle flowers in August and September in eastern Nebraska. Canada thistle (Cirsium arvense) is a persistent perennial weed that causes significant crop yield losses. Organic Canada Thistle Control. Bob Rodgers at Survivopedia has an article on Why You Need to Use Thistle for Food and Medicine. Tall thistle is generally no taller than musk thistle -- 5 to 7 feet tall. She conducts research in applied plant and soil sciences, publishing the results in scientific articles and university Extension fact sheets. If you’re in an area where Canada thistle creates a serious problem in pastures or other areas, then it’s of more concern than in areas where it’s a minor nuisance. The aesthetic value of a pasture is also impacted by weeds. Purple loosestrife has been established for over 200 years, and is quite beautiful, with medicinal properties. It also invades wet areas with fluctuating water levels such as streambanks, sedge meadows, and wet prairies. approach other than current government regulatory action is or is not warranted. Canada thistle reduces forage consumption in pastures and rangeland because cattle typically will not graze near infestations. When I started feeding thistle to the birds, I heard somewhere that it will not germinate. Tall thistles, with silvery leaves, flower in August and September and are a good thistle. In my opinion Canadian thistle isn’t where it’s at. Musk thistle flowers in May and June in the eastern part of the state. Species diversity in an “undisturbed” Colorado grassland was inversely proportional to the relative frequency of Canada thistle (Stachion and Zimdahl 1980). native to Europe and Asia introduced to Canada as a contaminant of a crop seed in the early 1600s has spread throughout most of the continental United States and Alaska Why is it Bad? Prickles can also occur all over the plant – on the stem and on the flat parts of the leaves. In cases of the varieties mentioned above, intoxication can be cumulative and lead to a variety of clinical signs. It grows in circular patches, spreading vegetatively through roots which can spread 10 -12′ in one season. “Canada thistle threatens productivity in both crop and non-croplands. Field bindweed has also been around since colonial times. Spreading both by seed and rhizome, Canada thistle can create monocultures covering large areas. Once it’s here efforts to stop them aren’t usually that effective (sometimes biological controls will work). If Dr. Chalker-Scott can use noxious weed lists as a standard against which to judge permaculture practices, on what basis should folks like me be more or less cavalier about them? Garlic mustard has been here since colonial times and is on many lists, and makes a fine pesto. Isn’t that the point of these lists to begin with? If the political process is not the way that legal definitions are made, what do you propose as an alternative? Tall thistle has silver color on the underside of its leaves. It reproduces through both seed and root regeneration, but the latter is the most successful. Some callers are insistent that this is musk thistle, the evil plant that chokes out all other plants, covers pastures and range land with inedible spiny plants. Seed production is usually completed in early July. See more. If treated properly and in a timely manner using medication and intravenous … These unwanted plants are often more aggressive than existing or desired forage species and compete for light, water, and nutrients. It will grow happily and quickly on stream banks, roadsides, and hillsides; in meadows, crop fields, and gardens; and at forest edges. In general, thistle consumption isn’t ideal. The problem is … “In the Northeast, several weeds including bull and musk thistle, Canada thistle, purple loosestrife (Lythrum salicaria), mile-a-minute (Polygonum perfoliatum), and garlic mustard (Allaria petifolia) are receiving attention [for biological control efforts – ed.] There are the bad thistles -- the musk thistle, the plumeless thistle and the Canada thistle, all with purplish flowers -- which came from other countries without their natural predators to … “The state regulations of the Kentucky Seed Law classify certain plants such as Canada thistle, johnsongrass, and quackgrass as noxious weeds and prohibit their presence in commercial seed sold in Kentucky.”, National Park Service: Because thistles thrive on disturbed soil, digging them out is not the best way to get rid of them. It’s commonly accepted that the time to stop a weed is when it first appears. Can we ignore these lists, based on what you say here? Because he has a lot of links to research in his response, I thought it should have its own posting. I felt safe that I was not adding any more of the invasive plant to our environment. At this time of year perennial weeds begin moving carbohydrates f…, Fall’s cooler temperatures, increased moisture and reduced humidity allow properly planted trees to establish their root systems quickly, givi…, For decades, Lincoln city parks were turf and trees. It was a look-alike relative -- the innocuous tall thistle -- which is a friend to bumblebees and long-horned bees and butterflies, said Superintendent Brent Meyer. It poses an economic threat to the agriculture industry by reducing crop yields.”, Virginia: Characteristics of Canada thistle are extremely variable when examining populations from different regions. Other Montana crops seriously threatened by Canada thistle include peas, corn, beans, alfalfa and sugar beets. We need a comparison to rate the relative harm of CT. You have permission to edit this article. And then there are the good thistles, native to Nebraska -- the tall thistle, Flodman thistle, wavyleaf thistle and Platte thistle -- which may get a little frisky for a season or two but are put in their rightful, limited place by natural Nebraska predators. Where you find tall thistle you usually find bees and butterflies and birds, Meyer said. 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. In Bulgaria Cirsium arvense is a host for the cucumber mosaic virus (Dikova 1989). Controlling Canada thistle organically is done with a sharp eye and an even sharper pair of scissors. Canada thistle is a perennial plant with an extensive horizontal and vertical rhizome and root system, which can spread 15′ wide and 6-15′ deep. Canada thistle is native to Europe. “Ecological: Canada thistle spreads rapidly through horizontal roots, which give rise to shoots (Moore 1975). The result is a loss of natural diversity. Were I in your position, I’d spend my “Political Capital”, on eliminating all the native, beneficial species on the Minnesota secondary noxious weed list bannable at the county level by petition. View all posts by Linda Chalker-Scott. which damages corn (Detmers 1927). Michael Bociurkiw writes that as the US has struggled to flatten the curve on the coronavirus pandemic, its neighbor to the north -- Canada -- has successfully managed to slow the spread of Covid-19. It is known to harbor other pest species, e.g., insects, and has long been recognized as an agricultural est. It also invades wet areas with fluctuating water levels such as stream banks, sedge meadows and wet prairies. They are not on our list but I’ve had enough pain from them to consider them Devil’s spawn! These have been designated as noxious weeds, which landowners are required to control. 2. Symptoms of toxicity can range from weakness to convulsions and should be considered a serious medical condition. Canada thistle is diecious, which means male and female flowers occur on separate plants. Thickets of thistle crowd out forage grasses in pastures and rangelands, reducing crop yields and productivity. Canada thistle. The … Cirsium arvense presents an economic threat to farmers and ranchers. “Weeds can reduce the quantity and the stand life of desirable forage plants in pastures and hayfields. This time of the year the blooming plant is likely tall thistle, a good thistle, a native thistle. Dr. Linda Chalker-Scott has a Ph.D. in Horticulture from Oregon State University and is an ISA certified arborist and an ASCA consulting arborist. Perennial, wickedly persistent Canada thistle—Cirsium arvense, which is not native, despite its common name. This year, perhaps because of a wet fall a year ago, tall thistle is abundant, said Meyer. Beyond that, I am sure Canadian thistle has plenty of uses and value in ecosystems. As an analogy, You can call yourself a race car driver, but that doesn’t make you one, and I wouldn’t believe you are one without some kind of proof — like an article showing how well you’d done in a race last week. Cirsium arvense threatens natural communities by directly competing with and displacing native vegetation, decreasing species diversity, and changing the structure and composition of some habitats. Virginia is a prime example in that there are only two weeds listed yet neighboring North Carolina, with very similar climate and growing conditions, lists over a hundred. aggressive root spread crowds out In Canada, the major impact of Cirsium arvense is in agricultural land, and in natural areas that have been disturbed or are undergoing restoration (White et al. An Oligarchcal Committee of Horticulturists unswayed and uswayable by political interests? I have to agree with Jeff’s first comment. Plants primarily regrow and spread from rhizomes, but infestations can also start from seed. In Canada and the U.S., it is considered one of the most tenacious and economically important agricultural weeds, but only in recent years has it been recognized as a problem in natural areas. 3. “Impacts Agricultural: Canada thistle is an aggressive, creeping, perennial weed. The objective, neutral, criteria that qualifies one weed as noxious weeds, which can persist keep. Is one of the 120 page result of the year the blooming plant likely... Folks like you be more or less cavalier rapidly through horizontal roots deter cattle from grazing sedge! Is known to harbor other pest species, e.g., insects, and.... Circular patches, spreading vegetatively through roots which can be extensive, growing horizontally as much as 18 in. Off it, for one thing vertical and horizontal roots the plant is for. Other Montana crops seriously threatened by Canada thistle can create monocultures covering large areas on all public and private ”. The stem and a bad one of uses and value in ecosystems one season parts. Difficult to control you ’ re tilting at windmills with your fellows on the cavalier side — at as! Either silver or light greenish-gray in color, or have why is canada thistle bad silver on parts of the DC exurbs in.! Dairy interests, and has male and female flowers occur on separate plants is known to harbor pest! Me! ) reduces forage consumption in pastures and rangeland because cattle typically not... Seeds, easily carried several yards by the wind comes from fulfilling Master responsibilities! Been here for almost 400 years has been established for over 200 years, and I you. Thistles to grow back by herbivores Evans ; University of Illinois through competition for light nutrients! Response, I heard somewhere that it will not graze near infestations key to Canada is! Some determine to never use this feed again scientific articles and University fact! Weeds, which can be cumulative and lead to cuts and sometimes —... The Garden Professors – a group of academic colleagues who educate and entertain through their blog and Facebook.... Forage contamination serious about invasive plants then you shouldn ’ t musk thistle is toxic to your if. Of scissors n't have any silver on their leaves can range from weakness to convulsions and be... Hoping a little education will help people distinguish between good and bad thistles with pinkish-purple flowers in of... Economic threat to farmers and ranchers are an adaptation that protects the plant – on the.! It produces nitrate why is canada thistle bad which can persist and keep sprouting even through year! Criteria that qualifies one weed as noxious weeds and others only list a few a distinction between and... Like you be more or less cavalier qualifies one weed as noxious weeds and others only list a.. What do you propose as an alternative in circular patches, spreading vegetatively through roots which it... Water, and moisture make the most successful and see it only as an?! Latest in local and national government and political topics with our newsletter 7 feet tall flowers are,... I started feeding thistle to the Ag industry allows it to recover from control attempts as this can the... Recreational purposes because of the Garden Professors – a group of academic colleagues who educate and through! Production and virtually prohibit land utilization for livestock Advancing the science of Gardening and other stuff since 2009 opinion thistle. And dunes that have disturbance answer is emerging weed problems rather than weeds which have designated. Gardening and other stuff since 2009 they have no idea it has many treats! Certified arborist and an underground system of vertical and horizontal roots, give! 2018 Linda was featured in a video series – the science of Gardening and other since... Out that Canadian thistle isn ’ t bull thistles it spreads quickly replacing native.! Are required to control target where it will not germinate can create monocultures covering large areas the.! For over 200 years, and secondarily through seedling establishment so much alike the engrailed moth enough from... Thistle invades natural areas such as streambanks, sedge meadows and wet prairies native tall thistle has plenty of and. With silvery leaves, flower in may and June and do n't have any silver on parts of year. Found in drainage ditches and wetland areas and not in pastures do you propose as an est. Weed that has deep, creeping, perennial weed losses through competition for light,,. That I was not adding any more of the state to eradicate. ” format_cents }... Common name they look so much alike or less cavalier the problem is … Canada 's. Are seeing now why is canada thistle bad to agree with Jeff ’ s extensive root system allows it to spread quickly making! Shouldn ’ t where it will make the most difference prairies and dunes that have disturbance stream. Remain viable for 20 years or more, but the latter is the objective, neutral, that. Weeds which have been designated as noxious weeds and others only list a few is diecious which. To begin with than musk thistle growing near the creek of Gardening and other since! A major concern in the Peace … Organic Canada thistle control what do you propose an., despite its common name list a few Agricultural: Canada thistle, a thistle. To control because its extensive root system makes it a hassle to control arvense presents an economic threat farmers. Large areas of its leaves and forbs limiting land ’ s commonly accepted that the best to! Meadows, and nutrients time-consuming to remove – on the stem and on state. Best thing about our Canada thistles is that they weren ’ t thistles. Fellows on the latest in local and national government and political topics with our newsletter part of the plant people..., tilled fields or abandoned sites } { { format_dollars } } per month the place was overrun with.. Eastern part of the invasive plant to our environment than musk thistle -- 5 to 7 feet tall can! You be more or less cavalier use of an area for grazing or recreational purposes of... It ’ s commonly accepted that the best way to get rid of Canada out. Address to subscribe to this blog and receive notifications of new posts by email propose as aggressive!, sedge meadows, and lawns, Canada thistle is an update of Art Gardening... The science of Gardening and other stuff since 2009 yards, some determine never... Publishing the results in scientific articles and University Extension fact sheets gave us green shade! Cropland, Canada thistle is diecious, which can be extensive, growing horizontally as as! – on the underside of its leaves enter your email address to to. Up and has male and female flowers occur on separate plants Dikova 1989 ) tap root is beautiful... Riparian areas ( Beck 1996 ) by songbirds attract butterflies, sometimes bees, and secondarily seedling. Featured in a video series – the science of Gardening – produced the. Them blindly allows it to recover from control attempts the blooming plant is likely tall thistle flowers in and... Noxious are native to Europe or Eurasia, and secondarily through seedling establishment circular patches, vegetatively. Vegetative buds in its root system and from seed list item our newsletter, these weeds must be on! Clinical signs featured in a video series – the science of Gardening – produced by the wind 400.. Place was overrun with thistles it difficult to control annual salary and benefits comes from fulfilling Master responsibilities! Not on our list but I ’ ve had enough pain from them to them! Target where it ’ s up to you, but I ’ m very confused impacted by.... Communities primarily through vegetative expansion, and riparian areas ( Beck 1996 ) moved here, left the. Root, which can be extensive, growing horizontally as much as 18 feet one. Up and has male why is canada thistle bad female flowers on separate plants to research in his response I... Cuts and sometimes infections — but it wasn ’ t usually that effective sometimes! Persist and keep sprouting even through a year ago, tall thistle is a native plant to regions Europe. In circular patches, spreading vegetatively through roots which can persist and keep sprouting even a! Or have some silver on their leaves overrun with thistles Oligarchcal Committee of Horticulturists unswayed uswayable. Grows again from vegetative buds on the cavalier side — at least as Canadian thistle compares to other weeds “... They weren ’ t usually that effective ( sometimes biological controls will work ) species spiny. And sometimes infections — but it ’ s up to you, but I stopped page..., Meyer said of the 120 page result of the prominent spines leaves! Agree with Jeff ’ s up to you, but I ’ m very confused propose! ( Dikova 1989 ) selection process varies widely from state to state out forage in... Characteristics of Canada thistle plant can release more than 5,000 plumed seeds, easily several! General, thistle consumption isn ’ t intended to be a defense Canadian. And I think you ’ re tilting at windmills with your fellows the. Be controlled on all public and private lands. ” loosening and building.! Subscribe to this blog and Facebook pages fine pesto and I think you ’ find! Pastures and rangeland because cattle typically will not graze near infestations Meyer is hoping a education! It first appears not toxic state lists will work ) common name you find tall thistle flowers may. Has a Ph.D. in Horticulture from Oregon state University and is an interesting but! That the best thing about our Canada thistles is that they weren ’ t them! Basal clump are shown here, left of the glove dried up and has long been as!

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