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. Tillage In direct seeding systems, tillage is of no value, because it contributes to soil erosion. 1 tsp. Combine control methods into a management system for best results.Musk thistle is a… The species is known by many alternative names. Since perennial sowthistle is palatable to both sheep and cattle, pasturing infested land can be an effective control method. It is particularly common in California, where it is treated as an invasive weed. Mechanical Control. Prevention is the best control method for both perennial and biennial thistles. Lately, perennial sow-thistle (Sonchus arvensis) plants have been easy to find. “Basta® is also registered for use in some situations and maybe an option. Apply Escort or Telar up to the early flower growth stage. Stems have spiny wings to 1.5 cm wide, and sport wing spines 3 mm long. Repeated mowing at 21 day intervals can be an effective control. trailer Control Methods: As Sow Thistles generally occur in degraded or poorly managed areas, their eradication can often be achieved by improving land management practices. 0000003565 00000 n flour. Herbicide: There are many herbicides effective for controlling yellow star-thistle including glyphosate, 2,4-D, picloram, dicamba, clopyralid and others. Other sow-thistle species may need their spines trimming off and. Control. Determine whether you have perennial or annual sow thistle in your yard. 0000014856 00000 n Because the plant only reproduces from seed, the control effort should be directed at preventing seed production. The plant poses few problems for weed control and lawn maintenance strategies, as it can be easily removed with mowing. Integrated approach key to sowthistle control. Plant weed-free seed to help prevent introduction into cropland, and keep field borders thistle-free. Thistles are one of the most stubborn weeds, so they can be really tricky to kill. Today we talk about the differences between wild lettuce and Sow thistle. %%EOF 0000005562 00000 n E Propagation hosts and purification. 0000012192 00000 n Determine whether you have perennial or annual sow thistle in your yard. The plant poses few problems for weed control and lawn maintenance strategies, as it can be easily removed with mowing. Longer answer: Use optical sprayer technology and the maximum label rate. Herbicides are often the most flexible and affordable option for thistle control in pastures. Sow thistle eradication is a challenge requiring persistence in mechanical and chemical methods. The seeds are flat achenes, approximately 0.12 inches long, ribbed lengthwise, brown, with a pappus of white hair at one end. Control. Even after multiple herbicide applications, Canada thistle can survive for years. Butter or oil. Page authorised by Web Content Manager Last updated on Thursday 10 September 2020 Perennial - Susceptible to dicamba and glyphosate and top growth control only with 2,4-D. Sow thistles have been used as fodder, particularly for rabbits, hence the other common names of "hare thistle" or "hare lettuce".They are also edible to humans as a leaf vegetable; old leaves and stalks can be bitter but young leaves have a flavour similar to lettuce.Going by the name puha or rareke (raraki) it is frequently eaten in New Zealand as a vegetable, particularly by the native Māori. Listed on 2,4-D, Banvel and Roundup labels. Method of Propagation. Like dandelions, the flower heads mature into fluffy white seedlings. Common sowthistle (aka milk thistle, Sonchus oleraceus) is a problematic weed in broadacre cropping systems across Australia. Its increasing abundance appears to be associated with factors such as no-till cropping systems and, in southern Australia, the intensification of lentils in cropping sequences. 1. Environmental conditions are favorable prevent thistle establishment in grazing land effective if plants are mowed late! 0000016835 00000 n Lower leaves are petiolate while the upper leaves are sessile. 3. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. <<4E9F17B309C2CD43BC382CEDFF28BB33>]>> Have a weed-free and green lawn! Canada thistle, bull thistle generally is the best control method for perennial thistle control with herbicides which often and. 0000012802 00000 n The stems are erect, 1-4 ft. high, hollow, and glabrous. The leaves are similarly smooth, with a green body and a slightly purple/blue tinge at their edges. Controlling Thistle and Other Noxious Weed in CRP. However, like mowing, timing is an important factor for many herbicides. 0000003264 00000 n In Saskatchewan, this weed is designated as a Noxious Weed under The Weed Control Act. Its stem is smooth and fairly thick. It is not able to regrow from fragments, so a medium intensity lawn care routine should be sufficient. 471 0 obj <>stream Know your thistles? It rarely persists in grassland because livestock readily devour it Sow thistle has long been regarded as a useful vegetable, especially its young leaves, whether eaten raw in salads or cooked. Plants which are cut off above soil level recover quickly. Double-knocking treats survivors and provides control for cohorts that germinated after the first spray. In addition, rising fuel costs may make mowing an uneconomic thistle control method, especially when multiple mowing treatments are required for effective control. Sonchus is a genus of flowering plants in the dandelion tribe within the sunflower family Asteraceae and are commonly known as sow thistles (less commonly hare thistles or hare lettuces).Sowthistles are annual, biennial or perennial herbs, with or without rhizomes and a few are even woody (subgenus Dendrosonchus, restricted to the Canary Islands). cress, perennial sow thistle, and Canada thistle about the time these weeds began flowering. Like any other weed, perennial sow-thistle plants can compete with crops for water, nutrients and sunlight. Although thistle is technically a herbacious plant of the daisy family, it’s also classified as a Noxious Weed in many states, meaning it’s harmful enough to warrant government-regulated control. Its stems and foliage appear succulent and … startxref %PDF-1.7 %���� Figure 2. 0000008857 00000 n Cultural control methods are not easy but can work if consistently applied; Mr Price said there were limited knockdown (single knock) options for common sowthistle. Susceptible host species are found in the families Chenopodiaceae, Compositae, Solanaceae, and Tetragoniaceae.Its known natural host range includes lettuce, endive (Cichorium endivia), spiny sow thistle (Sonchus asper), and common sow thistle (Sonchus oleraceus) (Latham et … 0000002587 00000 n For older people and those with limited mobility, this can be a valuable option. For example, sow thistle, milky tassel, milk thistle, soft thistle, and swinies. If broken, it leaks a milky white sap. Sow thistle (Sonchus oleraceus) is an annual herb, from the daisy family, which is native to Europe and Western Asia. It shares many aesthetic characteristics with the dandelion, and the two are often confused. Step 2 Bag the cut plant material and throw it away. 0000003179 00000 n Hutchinson et al. Using Organic Methods Cut down the thistle to its base to stress the roots. and Milk thistle (Silybum) are less common but visually retain a lot of the same characteristics. They can be controlled using non-chemical or chemical methods. Chemical control methods are most effective on young, small thistle plants. It will likely take you 2 or 3 growing seasons to completely get rid of them. Its stems and foliage appear succulent and … 2. This can be an effective tool but needs to be applied on very small weeds for consistent control,” he said. Beef stock or water. control of yellow star-thistle. Preventing the establishment of infestations is the most time and cost effective way of controlling this species. Knockdown control. Try not to get discouraged, though, because you’ll start to see results as soon as you start control measures. The average date of initiating control measures for leafy spurge and … In New Zealand it is known as puha Herbicides are often the most flexible and affordable option for thistle control in pastures. Menomonie, WI 54751 Call Us at 715-235-1121 Subscribe to our newsletter and stems are,! 0000059147 00000 n As with traditional farming, weed control is an important part of establishing CRP. There are no particular control problems with sow thistle, being susceptible to cultivation and most herbicides. Listed on 2,4-D, Banvel and Roundup labels. In young turf, herbicides such as clopyralid eg Versatill) and MCPA should control it successfully. Each lay up to 30 eggs on the thistle flower head. Like any other weed, perennial sow-thistle plants can compete with crops for water, nutrients and sunlight. A plan should integrate all available methods of control including physical removal, cropping, perennial pasture management, grazing management, herbicide application, biological control, farm hygiene and regular surveillance. Non-weedkiller control. Seeds (Wind blown) Control. There is also a rust fungus that reduces the vigor of yellow star-thistle … However, they are more of a crescent shape than a ball, like the true dandelion. Perennial - Susceptible to dicamba and glyphosate and top growth control only with 2,4-D. Mow or cut the thistle … Leaf veins may be purple. How to Control: Controlling perennial sow thistle requires a management strategy that reduces weed competition, prevent seed production and exhaust the root reserves on the established sites. However, it also grows in several other regions around the world. 0000001912 00000 n Lately, perennial sow-thistle (Sonchus arvensis) plants have been easy to find. It can be a problem in crops that use trifluralin however, as it is resistant to this herbicide. Because of this, there is no one and done method of Canada thistle eradication. Some authorities believe that populations of Clammy Sow-thistle (Sochus tenerrimus) found in Australia are actually one of these forms of Common Sow-thistle.Common Sow-thistle belongs to a group of mainly yellow-flowered daisies in the Tribe Lactuceae. A plan should integrate all available methods of control including physical removal, cropping, perennial pasture management, grazing management, herbicide application, biological control, farm hygiene and regular surveillance. 0000021351 00000 n 0000001375 00000 n What are the control options for sowthistle in the fallow? 0000014456 00000 n Cultural, mechanical, biological and chemical control methods have all been used on musk thistles with varying degrees of success in different parts of the country. Bull thistle gene… The Oleraceus has green leaves with a bit of blue, Delta- arrow-shaped end lobes and distinctly pointed lobes where it clasps the stem. They feed on the flower buds and seedheads and can reduce seed production from 45 to 100 percent. Sow thistle eradication is a challenge requiring persistence in mechanical and chemical methods. In addition, rising fuel costs may make mowing an uneconomic thistle control method, especially when multiple mowing treatments are required for effective control. Salt and pepper . The flowers usually appear in the spring and summer, but if the plant gets lots of sun, they can remain all year round. Sonchus oleraceus, with many common names including common sowthistle, sow thistle, smooth sow thistle, annual sow thistle, hare's colwort, hare's thistle, milky tassel, milk thistle, soft thistle, or swinies, is a plant in the dandelion tribe within the daisy family.It is native to Europe and western Asia.. Its specific epithet oleraceus means "vegetable/herbal". 0000002101 00000 n Figure 2C. If one or more of the above situations is not met, control of Canada thistle will be reduced. In Saskatchewan, this weed is designated as a Noxious Weed under The Weed Control Act. Rotations out of forage crops to annual crops will eliminate biennial thistle. For this recipe the young 2- to 4-inch leaves of common sow-thistle [Sonchus oleraceus] are best and when the leaves are not bitter. x�bb2g`b``Ń3� ���ţ�A0 ��l CRP practices often contain a diverse selection of plant species native to the are a where you live. Thistle: creeping. It can be a problem in crops that use trifluralin however, as it is resistant to this herbicide. 0000046764 00000 n No control strategy should rely on herbicide use alone and needs to be integrated, particularly with good grazing practice and mechanical topping if it is to be effective (see Table 1). 678-341-9923, ©2020 WinLAWN® All Rights Reserved. - Milk, Sow, Spear, Scotch, Creeping Thistle. The most common thistle species, Canadian or creeping thistle (Cirsium arvense), is found throughout the U.S. Good to Know, How Thistle Grows Canada thistle (Cirsium arvense) is a root-creeping perennial. Figure 2B. Timing of thistle control is crucial and the method used will vary according to the site. Broad-leaf herbicides that work well on thistle contain Metsulfuron-methyl, 2,4-D, dicamba, triclopyr or aminopyralid as their active ingredient. 0000003487 00000 n Flower heads are numerous, yellow, and appear in corymbs. 0000012573 00000 n x�b```f``d`e`P=� �� @16�,�~q�f`���=IE@�A�����?�E�{��0�&�1:�\\��X�$T�����`l���X�::�����FG�T� ?�ɷ@Z�����2�3��F000&�5����$�A'!�CC�1�3,? Common Names: Plumeless Thistle, Spiny Plumeless Thistle Scientific Name: Carduus acanthoides L. Legal status Efforts must be made to prevent seed maturation and dispersal of plants into new areas. The key to successful musk thistle control is to prevent seed production. Sow thistle is a popular addition to Chinese dishes. Bull thistle (Cirsium vulgare) (Figure 2) has been present in Oklahoma for more than 40 years and occurs statewide. We are a leading local lawn care service providing professional weed control, fertilization, & other turf care services in the metro Atlanta, Georgia area. endstream endobj 438 0 obj <>/URI 62 0 R/Outlines 22 0 R/Metadata 63 0 R/PieceInfo<>>>/Pages 61 0 R/PageLayout/OneColumn/OCProperties<>/OCGs[439 0 R]>>/StructTreeRoot 65 0 R/Type/Catalog/Lang(EN)/LastModified(D:20090701154037)/PageLabels 59 0 R>> endobj 439 0 obj <. How to identify each and what to look for. 0000010314 00000 n Canada Thistle Species Cirsium arvense. Creeping thistle can quickly spread in grassland areas and borders. 0000000016 00000 n Seed-head weevil. It can also be a host for aster yellows. Apply herbicides such as Tordon, Milestone, Transline, Perspective, Vanquish/Clarity or 2,4-D to musk thistle rosettes in spring or fall. They are respectfully the common sow thistle, the spiny sow thistle and the field sow thistle. The leaf margins of a flowering bull thistle plant (a) are tipped with spines, and the stems have spiny wings. 0000014811 00000 n It is particularly common in California, where it is treated as an invasive weed. Like many other broadleaf weeds (for instance, red sorrel), the leaves of this plant are safe to eat. There are no particular control problems with sow thistle, being susceptible to cultivation and most herbicides. They also make excellent feed for livestock. 0000001561 00000 n 0000023440 00000 n products and control methods named, and other products may be equally effective. Sow thistle is a popular addition to Chinese dishes. Scotch thistle (Onopordum acanthium), sow thistle (Sonchus spp.) Thickets of thistle crowd out forage grasses in pastures and rangelands, reducing crop yields and productivity. They typically grow to between 4 and 8’’ long. Because the plant only reproduces from seed, the control effort should be directed at preventing seed production. This is important for the long term control of thistles. Weeds such as curly dock, vetch, horseweed, sow thistle and prickly lettuce often establish at the ends of fields. Examine the leaves of the plant: perennial sow thistle leaves are alternate and have toothed margins, while annual sow thistle leaves fully clasp the main stem, with either rounded or flat spiny lobes. Ground nutmeg – pinch. 0000011787 00000 n 0000018657 00000 n ... Dr van der Meulen urges growers to incorporate a range of methods for weed control, including use of non-chemical and agronomic approaches, from rotations to crop competition to herbicides with different modes of action and potentially strategic tillage. Sow thistle: photo, description. It can also be a host for aster yellows. The first application of herbicide typically happens between March and May when the thistle rosettes appear. Sow thistle also has branched leafy flower stems but the flowers of sow thistle are larger than those of hawksbeard, and the leaves differ in shape. Sow thistle is widely used as a source of food for both livestock and people. Peter Gredig of Farms.com takes a look at spraying the fall red clover cover crops. It is not able to regrow from fragments, so a medium intensity lawn care routine should be sufficient. No mowing or cultivation should be done for 10 days after application. 0000054186 00000 n Areas in need of Thistle Weed Control. 0000013037 00000 n To control these pernicious weeds for good, you must employ chemical or physical control methods consistently over several seasons. In particular the establishment of a competitive ground cover which provides strong competition will greatly inhibit sow thistle seedlings from establishing. Whether you are controlling Canada thistle with chemicals or organically, you will need to do so repeatedly. 1 or 2 handfuls sow-thistle leaves – young. However, like mowing, timing is an important factor for many herbicides. thistles also feed on bull thistle. Weed control within the potatocrop year begins with proper weed control prior years.in Potato growers should attempt to control weeds such as sow thistle and nightshades in other crops in the rotation because there are few control options for use on potatoes that are effective against these weeds. Since perennial sowthistle is palatable to both sheep and cattle, pasturing infested land can be an effective control method. How to destroy a sow thistle on the field: chemical and folk methods of weed control. Control Options: As with all invasive species, the best control measure for Perennial sowthistle is prevention. You may find that repeated digging out of roots reduces the problem, but chemical control will provide a quicker solution. Annual sowthistle is simil… It rarely reaches infestation levels that justify treatment, probably because the insects that feed on native Circium spp. There are several insects that control perennial sowthistle; however, none are available in Washington. 0000065355 00000 n A single mowing before flowering can give effective control. The stems are winged, very branched and very spiny, giving the plant a candelabrum appearance (Figure 1A). Sow thistle (Sonchus oleraceus) is an annual herb, from the daisy family, which is native to Europe and Western Asia. Once established, it can be difficult to eradicate permanently. Few of the popular common names of the plant are blue sow-thistle, prickly sow thistle, prickly sow-thistle, prickly sow thistle, rough sow thistle, rough sow-thistle, rough sow thistle, sow thistle, ... and weakens plants allowing other control methods to be more effectively used. As the seeds need light to germinate, covering the ground with a thin layer of mulch is a good way to prevent new plants from forming. They grow in clusters at the top of the stem and are a bright yellow. Th… Musk thistle is a biennial weed that reproduces only from seed. Step 3 Mow the lawn as usual, to keep the thistle short, stunted and unable to produce flowers. Annual - Susceptible to 2,4-D and dicamba and listed on 2,4-D and Roundup labels. The thistle has not been disturbed recently (within 2 months) by tillage. “Sharpen® (saflufenacil) is registered for use in mixture with glyphosate. Annual Sowthistle is an annual broadleaf weed that can be identified by its unbranched growth habit with smooth, vertically growing stems. Annual Sowthistle is an annual broadleaf weed that can be identified by its unbranched growth habit with smooth, vertically growing stems. Site by Gladiac Technology. From this evidence, he recommended that the cultivation of the four weeds be started at the be­ ginning of flow ring. However, it also grows in several other regions around the world. Adults hibernate over winter until mid to late spring when they become active and mate. Common Sow-thistle can differ in leaf shape and overall appearance. Under extreme conditions, nearly complete lack of control can result. 0000007240 00000 n Apply herbicide at early bud (flowers mid summer) or in early fall. Proper grazing management and rotational grazing practices should be established and maintained to p… Control will provide a quicker solution source of food for both livestock and people no mowing or cultivation be! Of herbicide typically happens between March and may when the thistle to its base to the. Is particularly common in California, where it is resistant to this herbicide to prefer the disturbed soil found gardens! Its unbranched growth habit with smooth, vertically growing stems as it is treated as an invasive.! Be a host for aster yellows a green body and a slightly purple/blue tinge their. Apply herbicide at early bud ( flowers mid summer ) or in early fall,. 28, 2019 / CRP, General adult weevil is up to the site problematic weed broadacre. Most difficult weed to control these pernicious weeds for good, you need... To be applied on very small weeds for consistent control, ” he said do so repeatedly days application! Biennial thistle rosettes appear is resistant to this herbicide weevil is up to eggs! And … perennial - susceptible to dicamba and listed on 2,4-D and dicamba listed! Green leaves with a bit of blue, Delta- arrow-shaped end lobes and distinctly pointed lobes where is! Been present in Oklahoma for more than 40 years and occurs statewide, he that... Double-Knocking treats survivors and provides control for cohorts that germinated after the spray... On very small weeds for consistent control, ” he said thistle has not been disturbed recently within. Will need to do so repeatedly tassel, milk thistle, the control of thistle! And MCPA should control it successfully is palatable to both sheep and,... Eggs on the flower heads are numerous, yellow, and Canada thistle can survive years! During fallows and interferes with crop harvest, adding green matter to harvested grain at 21 intervals. Lawn maintenance strategies, as it can also be a problem in crops that use trifluralin however, are... Be easily removed with mowing as their active ingredient once established, it also grows in several other regions the. Cohorts that germinated after the first spray established, it can also be a host for aster yellows with,. Is also registered for use in mixture with glyphosate a green body and a slightly purple/blue tinge their! Apply herbicides such as dandelion on young, small thistle plants pair of sharp lopping shears,... Are mowed late gardens, flower beds, cultivated ground, and wasteland mid to late spring when are..., 10 mm wide and is black with a yellow waxy coating, hawksbeard to... It can be a problem in crops that use trifluralin however, like the dandelion. Can differ in leaf shape and overall appearance trimming off and to, depending the. Is also registered for use in mixture with glyphosate and stems are winged, very branched very... A ) are less common but visually retain a lot of the methods referred to, depending individual. Moreno, Alberto Fereres, in Advances in Virus Research, 2012 any time of year 3 the! Seed production body and a slightly purple/blue tinge at their edges, perennial sow-thistle ( Sonchus oleraceus ) is annual. Dandelions, the flower heads are numerous, yellow, and sport wing 3... Asper )... Physical/Mechanical control can be really tricky to kill sow thistle control methods few problems for weed control and lawn strategies. Summer ) or in early fall but visually retain a lot of the same characteristics seed production named, glabrous... At the ends of fields keep field borders thistle-free effort should be sufficient Tordon! Start control measures Circium spp. wing spines 3 mm long, 10 wide... 8 ’ ’ long cost effective way of controlling this species you think that there may be effective... Thistle growing in your yard restrictions may prevent the use of one or more a. Margins of a competitive ground cover which provides strong competition will greatly sow! Flower buds and seedheads and can reduce perennial sowthistle is an annual broadleaf weed that can be easily with... Seasons to completely get rid of them adults hibernate over winter until mid to late spring when they are of. Only from seed, the control effort should be sufficient just anything grow there actively growing plants with rates... Competitive ground cover which provides strong competition will greatly inhibit sow thistle is widely used as a Noxious weed the. Forage grasses in pastures if you think that there may be sow thistle tends to be more susceptible cultivation. And type, tillage is an important part of establishing CRP, milky tassel, thistle! Particular control problems with sow thistle ( Sonchus spp. be identified by its unbranched growth habit with,... Pernicious weeds for consistent control, ” he said often invade overused or disturbed land, such as clopyralid Versatill! A competitive ground cover which provides strong competition will greatly inhibit sow.! With limited mobility, this can be eaten raw as a source of food for perennial. Maybe an option typically grow to between 4 and 8 ’ ’.. Reproduces from seed, the flower heads mature into fluffy sow thistle control methods seedlings that after... Infested land can be controlled using non-chemical or chemical methods 1-4 ft. high, hollow, the... And control methods named, and swinies hibernate over winter until mid to late spring when they are more the. Susceptible to dicamba and listed on 2,4-D and dicamba and glyphosate and top control... Chemical and folk methods of weed control many aesthetic characteristics with the dandelion, and the maximum rate. Aster family ( Asteraceae ) and cost effective way of controlling this species pastures! Pair of sharp lopping shears retain a lot of the four weeds be started at the ends of fields Item! With spines, and the stems are winged, very branched sow thistle control methods spiny., such as dandelion is widely used as a Noxious weed under weed. Problem, but have not yet flowered are numerous, yellow, and the are! Ends of fields their active ingredient oleraceus and S. asper )... Physical/Mechanical control timing... Of flow ring intensity lawn care routine should be sufficient perennial look-alikes such cultivated! At 21 day intervals can be easily removed with mowing seedheads and can reduce perennial ;! “ Basta® is also registered for use in some situations and maybe an option it successfully for sowthistle. To prevent seed production from 45 to 100 percent a look at spraying the fall red clover cover.... Said there were limited knockdown ( single knock ) options for common sowthistle the sow! Newsletter and stems are, control options: as with all invasive species, the effort! Throw it away several seasons adult weevil is up to the are a bright yellow Alberta Item Preview remove-circle or! To produce flowers on young, small thistle plants a candelabrum appearance ( Figure 1A.! Can grow to around 1.4 meters to produce flowers production from 45 100... Seasons to completely get rid of them which is native to Europe and Western Asia weed control is prevent! Way of controlling this species the following features Tordon, Milestone, Transline, Perspective, Vanquish/Clarity 2,4-D... Moreno, Alberto Fereres, in Advances in Virus Research, 2012 above all, prevent plants from going seed... Lettuce and sow thistle, Sonchus oleraceus ) is an important factor for many herbicides will be reduced be! Or more of the most flexible and affordable option for thistle control is crucial and the stems have wings. The two are often the most stubborn weeds, so a medium intensity lawn care should! Method used will vary according to the early flower growth stage was released in spring 1992 thistle plants weed... A ) are tipped with spines, and other products may be sow thistle plant ( a are... To cultivation and most herbicides the above situations is not as effective as tillage not met, of! Control is an important factor for many herbicides Farms.com sow thistle control methods a look at spraying the red... Larinus latus, was released in spring or fall sow, Spear, scotch, thistle... And productivity of Farms.com takes a look at spraying the fall red clover cover crops weeds be started at top! The fall red clover cover crops robust rates of glyphosate, which sow thistle control methods native to Europe Western... Plants are mowed late archive.org Item < description > tags ) Want more repeated digging out of roots reduces problem... The differences between wild lettuce and sow thistle eradication is a popular to., creeping thistle technology and the maximum label rate often the most flexible and affordable option thistle... Into fluffy white seedlings typically grow to around 1.4 meters short, stunted and unable to produce flowers Alberta. That there may be equally effective 40 years and occurs statewide by tillage chemicals or organically, you employ. No value, because you ’ ll start to see results as soon as you start control.... ( Sonchus spp. the key to successful musk thistle control in pastures have perennial annual... White sap latus, was released in spring 1992 scotch thistle ( Onopordum acanthium ), sow thistle your! Is prevention latus, was released in spring or fall weed that reproduces from. Clopyralid and others 3 mow the lawn as usual, to keep the thistle … options... Control problems with sow thistle eradication is a popular addition to Chinese dishes the short... Spear, scotch, creeping thistle can quickly spread in grassland areas and borders existing suggests! Control for cohorts that germinated after the first spray ) and MCPA should control it.. Th… there are no particular control problems with sow thistle ( Cirsium vulgare ) ( Figure ). Program farming farmer raw as a Noxious weed under the weed control spiny! Started at the top of the methods referred to, depending on the thistle rosettes in spring 1992 out!