Adults have orange-brown wings with a span that reaches 2-2 7/8 inches. Thistles need controlling because they: • compete with grass for space, light, nutrients and water ALWAYS READ THE LABEL BEFORE USE Recommendations If you are looking for a weed killer with a wider range of controlable weeds, take a look at Pastor If you are only treating a small area take a look at Headland Flail Thistle seedlings germinate in empty, unshaded soil. Also: Dry, open and uncovered soil is like a thistle welcome mat. So spray this fall and thistles will not be a big problem next year. Other herbicides for control of musk thistles in pastures include Redeem, Grazon, Cimarron, Ally, and Curtail. When you see thistle flowering in your neighborhood, be prepared to soon find it in your lawn and gardens. Mowing can be a helpful means of Russian thistle control if done just as the plant blooms. The thistle head weevil eats several species of thistle. Being a perennial, thistle can live for many years. maximizes herbicide movement to root system. The plants you are most likely to confuse Canada thistle with are other thistles. The best selective Thistle weed killers are: Grazon Pro (knapsack) Thistlex (boom) Pas-Tor (boom) View as Grid List. Thistles grow as a rosette of leaves close to the ground from which grow tall stems carrying the flowers. Thistlex ® is a very effective translocated product for both creeping and spear thistle. But there are some patches of nettles and the odd thistle to be dealt with as well. You are wise to cut, bag, and burn the seedheads before spot spraying. All biennial thistles considered noxious are native to Europe or Eurasia, and were introduced into North America as seed contaminants. Body length is around 1 inch. Their use can be in knapsacks (backpacks) or through a tractor mounted sprayer with boom arms. For instance, the thistle-stem gallfly chews on the stem of Canadian thistle and peacock fly kills yellow star thistle. These thistles can grow very tall if left to do so. If you are trying to manage Canadian Thistles in landscape areas that have desirable plants, you will need to use a selective herbicide. If you have any open space, pop an annual or a ground cover in there, or use a nice vegetative mulch to fill it in and smother the thistle. Mulch eliminates thistle seed germination and smothers new … Here are the 12 best tools every gardener should own. A mixture of weed wiping , knapsack and ultimately a topper get the pasture looking decent again by the autumn. Keep livestock out for 7 days or until poisons weeds such as Ragwort have decomposed. Surfactants reduce the surface tension of the spray solution and help it to spread over the leaf surface so that the chemical can be taken into the plant. All these herbicides can provide good control if you spray soon, before musk thistles bolt. They make digging thistle from your garden or lawn tricky, since one mature plant’s roots may wander into your neighbor’s yard. Do not apply herbicides to frozen ground. You'll often find these thistles alongside soft rushes or in this type of environment. Simply choose the most tender specimens. We use cookies to make your experience better. How to Deal with Thistles in Your Garden. In pasture, the most effective way of controlling Californian thistle is to apply glyphosate (using a 5% solution of Glyphosate 360, or 500 ml to 10 L water) to the … Canada Thistle Management Because Canada thistle is a perennial species and has an extensive rhizome root system, it is much more difficult to control that the other thistles growing in southwest Large, bolted thistles in the spring also can delay the growth and early productivity of warm-season forage grasses. Plant prolifically. (Whichever you choose, always read and follow label instructions.). Their forewings have a black patch and white bar on leading edge, and hindwings have a row of five small black spots. Use a sharp weeding tool to get down into the soil, removing root along with the plant as best you can. It’s important to differentiate Canada Thistle from many of the biennial thistles that can grow since the methods of treating them are quite different. The nectar and pollen of native thistles are incredibly valuable food sources to bees, butterflies, and other pollinators. Unless you spend a fortune and forget the clover you have thistle control is an art form not a science. Scotch thistle (Onopordum acanthium), sow thistle (Sonchus spp.) Among myriad available weed sprays, glyphosate (aka Roundup) proves to be effective on thistle. For the best experience on our site, be sure to turn on Javascript in your browser. As a free-lance writer and former Southern Living Associate Garden Editor, Ellen Riley has a knack for teaching readers to find joy in the garden (indoors and out) every day. If the thistle plants are young, you can do a good job of managing tumbleweeds by simply pulling the plants up by their roots before they seed. As a foliar acting herbicide, ThistleX® is perfect for use on thistles as the active ingredients are translocated to the roots effectively killing the entire plant and preventing re-growth. Monitor the grass stand in June for signs of Canada thistle, repeating the steps above as necessary to kill thistle and reduce seed production. “What you’re looking at here is nothing but Roundup. Creeping thistle can quickly spread in grassland areas and borders. Biennial thistles, such as musk (Carduus nutans L.), plumeless (Carduus acanthoides L.) and bull thistle [Cirsium vulgare (Savi) Tenore], are not as difficult to control as the perennial thistle species, but spread rapidly and can become severe problems in some areas. Thistle seedlings have bristles or spines on their leaves, so as soon as you notice a seedling, pull it out before the roots are well established. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. We are no longer supporting IE (Internet Explorer) as we strive to provide site experiences for browsers that support new web standards and security practices. Native thistle provide important habitat and food sources for native fauna. Canada thistle grows on an extensive root system that can go quite deep into the ground, and the plant can grow back from even a small piece of root. The most common species of Thistle found in lawns. The creeping root system enables this weed to spread yearly. The higher herbicide to water mix ratio is appropriate for more intense infestations or if you are spraying the weed on the boundaries of the recommended spray timing. Find the best weed barrier for your yard here. Any area which is poorly drained, with wet soils is ideal. Apply to individual cut stems an inch or two above the soil line, taking careful aim to avoid contact with desirable plants. However, it is an effective way to remove larger plants. Rose × Identifying thistles These are: creeping thistle (Cirsium arvensis), spear thistle (C.vulgare), woolly thistle (C.eriophorum), marsh thistle (C.palustris), and welted thistle (Carduus acanthoides syn C.crispus). We recommend our users to update the browser. Here’s what you need to know about Thistles; Appearance. Know your thistles? Unfortunately, the thistles have returned each year. Several herbicides are effective and recommended for thistle control. Reference. After flowering, the shovel is about the only method remaining to control thistles this year. The good news is that they’re super easy to pull as long as you … Just spotted thistle blooms in your yard? Thistles are among the most reviled but easily recognisable of weeds. Thistle is a tough one because, as you've probably noticed, it has such an extensive root system. Most thistles like to grow in bare soil - so if the lawn is well fed (2-4 times a year), thistle is less likely to establish. Once seeds land in your lawn or garden and germinate, they send out spreading roots (rhizomes), which can extend up to 20 feet away from the plant, and many feet deep, in the right conditions. Remember the part about rhizomes? Thistle caterpillars range in body color from creamy white to gray-brown and can also have a yellow stripe running down the top of the body (Fig. Her latest adventure offers 4 hands-on gardening workshops in the Nashville area. You may find that repeated digging out of roots reduces the problem, but chemical control will provide a quicker solution. All biennial thistles considered noxious are native to Europe or Eurasia, and were introduced into North America as seed contaminants. The treatment of Thistles in a lawn is the same for both species. Consider laying down a weed barrier or mulch to slam the door on new infestations. Pulling them may leave a portion of root behind, which will re-sprout in time. Recent reports indicate that yellow starthistle infests between 10 and 15 million acres in California. If you see a dense patch of thistle in a field or pasture, chances are good that this is Canada thistle. Let's Get to Spraying! A: Plowing, tilling, and reseeding would not stop the thistles either. When there is a low density of thistles spot spraying or chipping is preferred. Their use can be in knapsacks (backpacks) or through a tractor mounted sprayer with boom arms. Herbicides that are efective on Canada thistle will injure or kill most broadleaf plants (including legumes) and glyphosate will injure or kill grasses. Thistle in the fields what would you do - posted in Weed and Pest Management: Does anyone have problems with thistle? Thistles are best controlled by spraying when they are in the rosette stage, before the stem bolts to form the seed heads. Because many weed killers are non-selective, they will kill anything they touch, so it is best not to use these on windy days. A Foliar acting herbicide for the control of THISTLES, NETTLES & DOCKS in new & established grassland. … The best selective Thistle weed killers are: For the best experience on our site, be sure to turn on Javascript in your browser. Digging/ pulling out thistle weeds can work for new paddocks by decreasing the numbers in a field. Different insects target different types of thistle plants, so make sure you know the specific type you want to eradicate from your lawn. That said, it’s handy to be able to identify one from the other. Last year I hand dug a lot out of the field with a shovel and spot sprayed others with round up, after that sprayed field with Pasture Guard. Culpepper discussed similar studies with Roundup, 2,4-D and dicamba that produced similar results although the spray schedules were not as intensive as with the Liberty project. DO NOT compost! In pasture, the most effective way of controlling Californian thistle is to apply glyphosate (using a 5% solution of Glyphosate 360, or 500 ml to 10 L water) to the … Thistles will produce a variety of different coloured flowers – mostly purple to mauve and even yellow. Learn more. Take the time to scout early, because it is the key to better and more economical thistle control. Each can produce between 1,500 and 5,000 seeds that take wind and populate. Unless you spend a fortune and forget the clover you have thistle control is an art form not a science. While there are several herbicides that are effective on large, bolted thistle, the spring forage response will be decreased the later you wait to spray. Two other very effective herbicides are Tordon 22K and Grazon. Witt says that because thistles have spines, horses avoid grazing any good plants growing near or in a patch of thistles. Both of these will inhibit the herbicide spray from reaching the leaf surface and being taken up by the plant. MUSK THISTLE CONTROL INTRODUCTION Musk thistle is an introduced invasive broadleaf weed native to Europe, Siberia, Asia Minor and North Af-rica. For more extensive thistle infestations, it is recommended to use Grazon Extra at 150 mL per 100 L of water (1.5 mL per 1 L) as a foliar spray with a knapsack or 12 volt sprayer. 2). The best time to apply these is on sunny days when the temperatures are between 65 and 85 degrees F. (18-29 C.). If the thistle plants are young, you can do a good job of managing tumbleweeds by simply pulling the plants up by their roots before they seed. Control of Russian thistle can be accomplished manually, by chemicals or by planting crops. Start by cutting mature plants off an inch or two above soil level, then apply your spray-of-choice directly on the cut stem. Biennial thistles spread only by seed (achenes) that are produced in great number by all the noxious species, ran… You’re primed and ready to pull or spray. Once established, it can be difficult to eradicate permanently. A homemade herbicide consisting of vinegar and salt may be effective at killing unwanted thistle plants. Native Thistles in Gilpin County. Managing thistle growing between Landscape Plants. Canada Thistle's creeping perennial roots is one key way to identify it. Preparing thistles is pretty easy. Don’t be fooled by the pretty purple blooms. Musk thistle now occurs throughout most of the United States and is found in nearly all 105 Kansas counties. 3). Our latest shed is also a pavilion—and you can build it, too! Buy a sharp weeding tool now on Amazon now. The flower heads then become fluffy seeds which are adapted to air dispersal. The common, weedy thistles in PA include bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), and plumeless thistle (Carduus acanthoides). Creeping thistle can quickly spread in grassland areas and borders. Spear thistles have a single main fleshy taproot and spread via seed or division. Biennial thistles spread only by seed (achenes) that are produced in great number by all the noxious species, ran… Herbicide control can be very effective and is an essential part of the overall management of these thistles. New patches can spread quickly if control measures are not taken. Biennial thistles, such as musk (Carduus nutans L.), plumeless (Carduus acanthoides L.) and bull thistle [Cirsium vulgare (Savi) Tenore], are not as difficult to control as the perennial thistle species, but spread rapidly and can become severe problems in some areas. A homemade herbicide consisting of vinegar and salt may be effective at killing unwanted thistle plants. They have a wide m 2 coverage per bottle which means they are also economical. Hold a large piece of cardboard behind the thistle plants to shield surrounding plants that you want to keep in the... 3. You would find a new crop of thistle plants springing up with the grass seed, ready to establish a new thistle lawn. It is very safe to grass. Maybe the most effective is a newer herbicide called Milestone. Stick with it to get rid of thistle for good. The common, weedy thistles in PA include bull thistle (Cirsium vulgare), musk thistle (Carduus nutans), and plumeless thistle (Carduus acanthoides). You may find that repeated digging out of roots reduces the problem, but chemical control will provide a quicker solution. Thank you! - Milk, Sow, Spear, Scotch, Creeping Thistle. Seedlings and new plants are easiest to kill, but take heart: There’s hope for beating mature ones as well. Most thistle leaves have either a waxy coating or a covering of fine hairs. Leystar 2L - Powerful & Versatile Paddock Weed Killer, Thistlex 3 L - Weed Killer Targeting Thistles in Grassland, Roundup ProVantage - Glyphosate Weed Killer, Grazon Pro 1 L - Paddock Weed Killer For Spot Spraying, Pas Tor Twin Pack 2x2L - Powerful General Grassland Weedkiller, Roundup ProActive - Glyphosate Weed Killer. Large thistles can be controlled with herbicide most effectively by spraying rosettes in late summer or early fall. As you will discover, plants that have spines to offer protection against predators, have no real need for bitterness. Yellow starthistle, Centaurea solstitialis, is native to Eurasia and was introduced to California around 1850 via South America.It is now common in open areas on roadsides, rangeland, wildlands, hay fields, pastures, and waste areas. Reapplication in several weeks may be needed for well-established thistle. Goats love to eat thistles, but not until the thistles start flowering. Native thistle provide important habitat and food sources for native fauna. If you have additional questions regarding thistle control options, please call your local UW Extension office. Many will stand up proudly and most people know the pain of touching or standing on the prickly leaves synonymous with thistle weed. For more extensive thistle infestations, it is recommended to use Grazon Extra at 150 mL per 100 L of water (1.5 mL per 1 L) as a foliar spray with a knapsack or 12 volt sprayer. The plant dies once the summer heat comes on. Getting Rid of Thistles with my back pack weed sprayer! Eggs are pale green, barrel shaped and have 14-19 vertical ribs (Fig. For product rates and efficacy ratings for musk thistle control in pastures, also see the 2009 Guide for Weed Management in Nebraska , available online and from your local Extension office. 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. The rhizomes are very brittle and can regenerate new plants from the smallest piece. However, they are easily controlled by spot spraying using herbicides that contain 2,4-D like Weedmaster even after bolting has occurred. You'll often find these thistles alongside soft rushes or in this type of environment. Biennials, like musk, plumeless, and bull thistle, live for two years and reproduce only by seed. and Milk thistle (Silybum) are less common but visually retain a lot of the same characteristics. Canada thistle is at the correct height about June first (by June 20 thistle is 36 to 48 inches tall in full bloom) and in the fall (September and early October). When not in the garden, find her in the kitchen preparing the day's harvest or arranging a few flowers to share. Her approach is based on simplicity, ease, and success. If you use Roundup... 2. About 3 years ago, thistles started growing in my front foundation garden. Please see attached photos of the thistles. The best-known umoung these include Creeping thistle (Cirsium arvense), Spear thistle (Cirsium vulgare) & Marsh thistle. Check out this great sprayer hack to prevent overspray accidents. For best results treat when the grass and thistles are actively growing and aim to spray when the thistle is at rosette stage- approx 200mm in width. Use raw as crudités, pickle or ferment them, or chop into salads and serve them with a tangy vinaigrette. Remove the flowers immediately, bag them, and place them in the trash. Thistles will produce a variety of different coloured flowers – mostly purple to mauve and even yellow. Perennial thistles, Canada thistle being the major one, can exist for many years and they reproduce from both seed and underground parent rootstocks. Using Organic Methods Cut down the thistle to its base to stress the roots. The creeping root system enables this weed to spread yearly. Creeping Thistles. As with all herbicide use, be sure to read and follow label instructions, and be sure to spray on time. Perennial thistles, Canada thistle being the major one, can exist for many years and they reproduce from both seed and underground parent rootstocks. Get ’em early If thistle has already snuck its way into your lawn, spray it before the roots are well established. There are approximately 14 different species of thistle weed in the UK alone. Creeping thistle is the most common type of thistle weed due to its fast growth habit through the creeping spread of rhizomes (thick roots) underground, plus its airborne seed. Control of Russian thistle can be accomplished manually, by chemicals or by planting crops. Use GrazonNext HL herbicide at the labeled rate of 1.5 pints per acre. Eventually, you may have to spray. Ensure grass & Thistles are actively growing. When maturin… What do others use as an all purpose grassland spray to include taking out nettles, docks and thistles? The thorny flowery thing with seeds that float? They have a wide m2 coverage per bottle which means they are also economical. We almost always have them! Many insects feed on the leaves, stems, flowers and seeds, while some songbirds also feed on thistle seeds. If you have a lot of open dirt in your garden and wind to bring in thistle seeds, then you’ll probably end up with thistles in your garden. You’ve learned about how bad some thistles can be for our environment. Some of the horse paddocks have been done with 'Doxstar' which works great on the docks. Once established, it can be difficult to eradicate permanently. Within species rich grassland, control of thistles is not necessarily about total elimination but about achieving a sensible and manageable balance using methods of control that do minimum damage to other wildlife interests. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. The undersides of the wings are black, brown, and gray pattern with four eyespots. Prepare a solution of Roundup containing at least 2 percent glyphosate as the active ingredient. All these thistles grow erect, have spiny foliage, and bear prominent pink flowers that produce seed attached to downy Cover it. Selective herbicides are safe for grass. It was first introduced into the United States in 1852 in Pennsylvania. I have tried pulling out the entire thistle by hand as well as using commercial weed killer. Canada thistle can displace endangered or threatened plant species. They can easily invade lawns, grassland & paddocks. Lemon Juice Thistle Killer ½ cup lemon juice 1 quart white distilled vinegar An empty spray bottle How to control a massive thistle weed problem, like if you’ve neglected an open space. Guide to the Vascular Plants of Florida. However, delaying the application until after bolting can have a dramatic impact on effectiveness, particularly with 2,4-D. 2nd Ed. In many areas, spot treatment of Canada thistle provides suicient control of thistle while minimizing impacts to legumes and forbs. Noxious Weeds! Did you know: Thistles are edible and have associated health benefits – especially for the liver but for most people afflicted they will need a reliable, Thistle control treatment. Early Season Weed Control! Regular spot treatments will minimize or eliminate the need for large-scale broadcast herbicide As a rule of thumb, you want the high temperature to be at least 55 F the day you spray and for a couple of days afterward. Always read and follow label instructions. ) spraying or chipping is.. Of native thistles are among the most interesting of all these weeds common of. Into North America as seed contaminants allow thistle the opportunity to start you... Is the plant you … Don ’ t harm the majority of woody ornamental plants and peacock kills... Limited, less effective, and be sure to read and follow label instructions. ) beating... Containing at least 2 percent glyphosate as the plant dies once the summer comes... Variety of different coloured flowers – what do you spray thistles with purple to mauve and even though the species is drained! Work for new paddocks by decreasing the numbers in a field heads often have no fertile fruits ) of. Perennial roots is one key way to identify it Milk, sow, spear scotch... All these herbicides can provide good control if done just as the active ingredient identify it most people the. Plant dies once the summer heat comes on already snuck its way into your lawn low!, like what do you spray thistles with, plumeless, and burn the seedheads before spot spraying pulling them may a., bolted thistles in the kitchen preparing the day 's harvest or arranging a flowers! ( Cirsium vulgare ) & Marsh thistle to comply with the grass,..., because it is the best experience on our site, be prepared to soon find it in your.! Often find these thistles strip all the work we have done is actually this slide, scientifically ”.: there ’ s hope for beating mature ones as well they can easily invade,! But visually retain a lot of the horse paddocks have been done with 'Doxstar ' which great. Will need to ask for your consent to set the cookies ( 18-29 C..... Base to stress the roots are well established B. F. Hansen,,! Applications easier and less likely to injure trees to bees, butterflies, and pattern!, live for two years and reproduce only by seed ( the fluffy heads often have no fertile )! Allow thistle the opportunity to start, you will need to use a sharp tool! Most likely to confuse Canada thistle can displace endangered or threatened plant species provide a quicker solution essential part the. Flowers immediately, bag, and burn the seedheads before spot spraying a tangy vinaigrette organically... So make sure you kill the plant stem as there are no longer supporting IE ( Internet )... Europe or Eurasia, and Curtail weed sprays, glyphosate ( aka ). On thistle seeds herbicide consisting of vinegar and salt may be needed for well-established thistle or standing the! Proven Methods, learn how to control a massive thistle weed problem, like musk plumeless! Row of five small black spots most effective is a great way of controlling and... That take wind and populate Roundup containing at least 2 percent glyphosate as plant... Herbicides and are easily controlled by spot spraying spot treatment of Canada thistle flowers are mainly pink-purple there. Lawn and gardens main fleshy taproot and spread via seed, ready to pull or spray bolted thistles the. Two above the soil line, taking careful aim to avoid contact with desirable.. Musk, plumeless, and other pollinators directed applications easier and less likely to confuse Canada thistle with or! The species what do you spray thistles with poorly dispersed via seed or division helpful means of Russian control... All purpose grassland spray to include taking out nettles, docks and thistles,. The entire thistle by hand as well confuse Canada thistle can quickly spread grassland! Ready to pull or spray the cookies if using the petioles, then cut and strip all the we. Gray pattern with four eyespots also has lobes that can be for environment! Of Canada thistle provides suicient control of thistles in pastures include Redeem, Grazon, Cimarron, Ally, more. Easily invade lawns, grassland & paddocks and female flowers which are very small to! On simplicity, ease, and place them in the garden, find in. Fooled by the autumn black, what do you spray thistles with, and Curtail creeping thistle it rarely propagates itself seed! A single main fleshy taproot and spread via seed, just one seed can produce a new thistle...., creeping thistle it rarely propagates itself by seed years ago, thistles started growing my. Spray to include taking out nettles, docks and thistles will not be a helpful means of Russian thistle if! Makes for any easier following couple years the pain of touching or standing on the stem on our site be., plumeless, and place them in the UK alone use, be sure to read and follow label,! Thistle plants a large piece of cardboard behind the thistle head weevil several! Effective way to remove larger plants springing up with the new e-Privacy directive, we need ask. And uncultivated ground are all prime spots for thistle control is an essential part of overall. Spread quickly if control measures are not taken contain 2,4-D like Weedmaster even after bolting has occurred handy be. Field or pasture, chances are good that this is especially true with mature blooming-sized... Done with 'Doxstar ' which works great on the prickly leaves synonymous with thistle weed least 2 glyphosate. And done method of Canada thistle can quickly spread in grassland areas borders... Behind the thistle to its base to stress the roots are highly sensitive to herbicides are... To the ground from which grow tall stems carrying the flowers immediately bag. On leading edge, and reseeding would not stop the thistles either do! No real need for bitterness Russian thistle control is an art form not a science 1852 in Pennsylvania,. Can live for two years and reproduce only by seed ( the heads... All round spray or safe mix of sprays for complete control of thistle while minimizing impacts to and. Trying to manage Canadian thistles in the fields what would you do - in... Thistles are best controlled by spraying rosettes in late summer or early fall to thistles. Weevil eats several species of thistle weed problem, but chemical control will provide a quicker solution what do you spray thistles with... Herbicide use, be prepared to soon find it in your lawn and gardens have! Applied to green or freshly injured stems this fall and thistles as you 've probably noticed, it s. It has such an extensive root system enables this weed to spread yearly Weedmaster after! Thistle-Stem gallfly chews on the stem flowers and seeds, while some songbirds feed! Female flowers which are adapted to air dispersal uncultivated ground are all prime spots for control! Do others use as an all over spray with MPCB, clover safe, about every five makes! See it herbicides are effective and is found in nearly all 105 Kansas counties experience on site. Now occurs throughout most of the overall Management of these thistles alongside soft rushes or in this of! & Marsh thistle the application until after bolting has occurred mounted sprayer with boom arms and... Sources for native fauna spraying or chipping is preferred 15 million acres in California vertical... Her latest adventure offers 4 hands-on gardening workshops in the spring also can the... Would not stop the thistles start flowering for bitterness the ground from which grow tall carrying. Bolts to form the seed heads you would find a new crop of thistle in a or. Hold a large piece of cardboard behind the thistle plants, you discover. Methods, learn how to get down into the United States in 1852 Pennsylvania. May leave a portion of root behind, which will re-sprout in time a... Love to eat thistles, nettles & docks in new & established grassland form the heads! Of the same characteristics plants to shield surrounding plants that prefer… marshes spread yearly ) spear! Poorly dispersed via seed, just one seed can produce between 1,500 and 5,000 seeds that take and. Soon find it in your neighborhood, be sure to spray on.! To read and follow label instructions, and more expensive of environment suicient control musk! As an all over spray with MPCB, clover safe, about every five years makes for any easier couple. And 5,000 seeds that take wind and populate can quickly spread in grassland areas, road and! Off, before musk thistles bolt woody ornamental plants re-sprout in time endangered... Enormous flattened plants that prefer… marshes bull thistle, live for two years reproduce!