During the first growing season, the plant forms a rosette. PLANTS Profile - Cirsium discolor, Field Thistle Zouhar, Kris 2001. Get notified when we have news, courses, or events of interest to you. Bull thistle overwinters in this stage. If you find a stand of thistle in bloom, come back each day for a week and harvest the mature flower heads as they open. This plant and the related entities and synonyms italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. By now, the plant may be browning and dry. But if you are game to tolerate a few prickles, once you see the white silky parachute tail that develops on the seed start to open, it is time to harvest the whole flower head before it opens fully and disperses the seed parachutes to the wind. fields, burned areas, and logged areas. (Accessed January 2016). Digital Atlas of the Virginia Flora (http://www.vaplantatlas.org). Milk thistle was being used for medicinal purposes as long ago as the first century A.D. The foliage of bull thistle has stiff hairs on top and a woolly appearance on the bottom; while Canada thistle is smooth on top and either smooth or hairy on the underside. The rosette does produce a taproot so go as deep as necessary to remove it. The Canadian thistle has a slender (usually purple) ridge which is harder to notice and the Bull thistle lacks a glutenous ridge altogether. Thistle was once a revered plant and flower. It can grow up to 7 ft in height, but 2 to 6 ft is more common. The more flowers that develop, the smaller they are, but that doesn’t diminish the enthusiasm of wild visitors. But this native species—field thistle— really stands out as a very tall species, and towers over my head at about 8 feet. A rather bland flavor, the root is best used mixed with other vegetables. The mid to upper stems of the bigger plants have narrow, very spiny leaf-like wings that run lengthwise on the plant. Musk thistle is similar in growth habit and appearance to Bull Thistle (Cirsium vulgare), however bull thistle has many hairs on the upper surface of the leaf blades unlike musk thistle which mostly lacks hairs. This plant is much different than Canada thistle. Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War — most likely mixed in agricultural seed. The Bull Thistle, or Cirsium horridulum, is one of those wild edibles that you pass by every day, and would never think about eating until you’ve had a chance to taste one. The leaves of a bull thistle are large, woody and are flatted and basal rosette during their firs… Citation: Guenther, K. (2017, January 12) Field thistle as wildlife food [Web log post.] By entering your email, you consent to receive communications from Penn State Extension. Pre-emergent herbicides include Dithiopyr (Dimension) can be used in landscapes and turf. The following year the spine covered stems elongate during the summer and produce more lance shaped leaves. Hopefully you will see the seed pull out with the pappus. But thistle is an easy to identify genus and an easy to find plant. This doesn't prevent bull thistle seeds from blowing in from other areas--individual plants can be dug out of landscape beds. Field Thistle most closely resembles Tall Thistle (Cirsium altissimum), which also has soft needle-like spines on the floral bracts, hairy stems and white on the underside of leaves. Comparatively, Canada thistle is a perennial that reproduces through underground rhizomes and wind-blown seeds. Newly emerged leaves are egg-shaped and have spines along the edge. The white pappus “parachute”or “hair”, is about ¾ inch long (20+ mm). Bull Thistle Cirsium vulgare Aster family (Asteraceae) Description: This plant is an obligatory biennial that forms a rosette of leaves during the first year, and bolts upward during the second year to produce flowers. Bull thistle reproduces only from seeds which germinate in the spring. You have to really love your rehabber to collect thistle seed. The leaves are narrow and deeply incised, with spines on the end of each leaf lobe. With its vivid purple flowers and prickly leaves, each type of thistle shares similar characteristics but also has unique identifiers. Bull thistle has leaves green on both sides. (1951). Once you have a bowl of fluff and seeds, pick up small handfuls of pappus fluff and rub between your hands. It was not a mistake that he had planted himself in the midst of a thriving rhododendron. Do you live in one of these Virginia counties? Many folks can recognize the spiny thistle plants of summer field and roadside. The Bull Thistle can take over a field in a few short years. Identification •Many species start as a basal rosette in fall If viewed from the side it looks a little like a green pineapple (to me). Most invasive thistles came from Europe in the 1600s. Flowers and fruit. Leaves are 3 to 12 inches long, deeply lobed with coarse prickly hairs on the top and woolly hairs underneath. Life was at stake. They are not the easiest to put up with while collecting due to the Bull Thistle’s defense mechanism. If you really want to figure out the species identification, one way to narrow the range of options is to see if the plant stem is spineless or with spines. Knapweed seeds are also eaten by birds. In: Fire Effects Information System, Online]. Available: http://www.fs.fed.us/database/feis/plants/forb/cirvul/all.html [2016, December 4]. Stems . If you pull out the pappus and there is no seed attached, then you can break the flower head in half after removing all the fluff and see if you can scrape out the seed that might still be lodged in the ovary. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Bull, musk, plumeless, and Scotch thistle (left to right). Seed/ Fruit Size:  The cleaned seed itself (no pappus) is about 3/16 inch wide (2 mm) and 13/32 inch long (4 mm) and reminds me of a banana pepper in shape. Flower Description : The flower color is a pale pink-lavender, like many thistles. The exact means of introduction are largely unknown, but it is speculated that they were brought over in farm seeds. Bull thistles (Cirsium vulgare) are exactly that – bullish. seeds rank #41 on our Super Seeds list. Bull thistle reproduces only from seeds which germinate in the spring. Wear thick gloves. Field thistle has leaves white underneath. New York: Dover Publications. Besides the spines on the plant, I have found I collect a lot of fluff for not so many seeds. Do more research to make sure you are identifying your target species correctly and not harvesting a threatened species! It was hiding in the dense growth at the edge of our orchard, with plenty of sun and little traffic. The inferior ovary is the swelled organ below the pink petals where the seed develops. Tall thistle is closely related to field thistle (C. discolor), and the two can hybridize where they grow near each other. This thistle plant I’m testing is a bull thistle, and the spines are huge and rigid. Flower Description: The flower color is a pale pink-lavender, like many thistles. (Unpublished Report) Richmond, Virginia: Virginia Department of Conservation and Recreation, Division of Natural Heritage. Knapweeds are thistle look-alikes that have a smaller bloom which blooms at the same time as thistle but knapweed has no spines anywhere on the plant. The PLANTS Database (http://plants.usda.gov, 4 January 2016). Red to purple, usually solitary flower heads consisting of only disk flowers are 1 to 2 inches wide and encircled by spine-tipped bracts. It forms occasional side stems, but remains erect in stature, reaching 3-6' in height. 2015. The flowers bloom and mature asynchronously–at different times– on any given plant, so keep checking back and harvesting over time. The pappus will bunch up as you rub and most of the seeds will fall out. Martin, A.C., Zim, H.S., Nelson, A.L. Field thistle is uncommon in the Ozarks but scattered to common elsewhere in the state. Some people may confuse thistle with knapweeds (Centaurea genus) of the same thistle subfamily or with teasels which are a different family of plants altogether. Scott, M. (2013). Many insects feed on the leaves, stems, flowers and seeds, while some songbirds also feed on thistle seeds. In this episode of the Northwest Forager we'll head out to the farm to forage flowers of the Bull Thistle aka Spear Thistle (Cirsium vulgare). There are long beige bristles covering it which extend out of the sepals that cover the ovary. Spiny-winged, hairy stems elongate during the second year, often branched up to 7 feet tall. Perennial sow-thistle is a perennial weed reproducing by seed and by buds on underground roots. Lobes on leaves are tipped with stout spines. JavaScript seems to be disabled in your browser. Dichlobenil (Casoran) and oxyfluorfen (Goal 2XL) are available for nurseries. Remember to always read the label for proper application sites and rates. Other names: Canada Thistle, Canadian thistle, Californian thistle, Creeping thistle, Field thistle, Corn thistle, Perennial thistle, Field thistle Where did it come from? Townsend, J. F. (2015, April) Rare Plants Natural Heritage Technical Report 15-10. The root of bull thistle is edible cooked. Given the opportunity, a bull thistle can grow to 5 feet tall, and send out multiple flower stalks. His presence and purpose were clear. Blooms June-Oct Typically in woods, less common in fields. Italian thistle Yellow starthistle Bull thistle (Blessed) milkthistle Scotch thistle Tocalote (Malta starthistle) Canada thistle All of these species are found at least one of Fresno, Kern, Kings, Madera, or Tulare Counties. Not common in MO. … It may not be important from a birdseed collecting point of view to identify any given thistle to the species level, unless you are very concerned about only collecting native thistles. Copyrighted data used with permission. If not kept under control, thistle will quickly take over a landscape. The foliage of bull thistle has stiff hairs on top and a woolly appearance on the bottom; while Canada thistle is smooth on top and either smooth or hairy on the underside. You will still see remaining brown flecks in the pappus ball, but these are not seeds, they are the dry brown leftover bits of the flower petals. Pasture Thistle Cirsium discolor Aster family (Asteraceae) Description: This biennial or short-lived perennial plant initially forms a low rosette of spiny basal leaves up to 1' across. Some of the non-native species certainly are noxious, invasive weeds that we do not want to spread. On smaller plants, the whole stem and branches are spiny-winged. Where: fields When: spring, summer Nutritional Value: some vitamins and minerals Other uses: cordage from stem fibers Dangers: Very prickly Young bull thistle Harvested mature thistle. Pinch and clean each flower head out a few times to get all the fluff and seeds. It can be dried and stored for later use. After dry, to clean the seed out of the flower head, hold the flower head (now brown, dried sepals) in one rubber-gloved hand (to avoid the prickles)and pinch the fluffy pappus (white feathery silky fluff)  with your other hand and pull it straight out  and place it in a large bowl. When encountered in turf, bull thistle can be managed through regular mowing which prevents the plant from developing flowers. You must have JavaScript enabled in your browser to utilize the functionality of this website. The pappus parts have no spines, so this process shouldn’t stick you at all. bull thistle . Teasels are somewhat useful to certain birds, but not as useful as thistle. Zouhar, Kris. Available: http://www.fs.fed.us/database/feis/plants/forb/cirvul/all.html [2016, December 4]. Coarse hairs on the upper leaf surface of bull thistle (right). The field thistle, #2 has thin out-turned needle-like … Why do we need this? Additionally, the flower heads and bracts of bull thistle gradually taper to a point when compared to those of musk thistle. Bull thistle can reach a height of 3 feet. Cloud, MN. The obvious thick spines are enough to draw blood if you’re fool enough to push one of these bad boys into your skin. Cirsium vulgare (bull thistle, common thistle, or spear thistle) is listed as a noxious weed in nine US states. Cirsium discolor, the field thistle, is a North American species of plants in the thistle tribe, within the sunflower family.It is native to thirty-three states in the United States as well four Canadian provinces. (When we first moved here, the place was overrun with thistles. Wildflowers Of WisconsinWild… See All Pest, Disease and Weed Identification, See All Beer, Hard Cider, and Distilled Spirits, See All Community Planning and Engagement, Common Pokeweed Identification and Management. When to Harvest: Shortly after flowering, the seeds mature and disperse to the wind on fluffy parachutes, like dandelion does. The root is rich in inulin, a starch that cannot be digested by humans. Pasture thistle (C. pumilum), unlike field thistle, doesn’t produce very many flowers. Bull thistle rosette (left). Leaves are variable: best determined by clusters of smaller flowers and creeping root system (versus tap roots in natives). U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). The risk of spreading non-native seeds into the larger ecosystem can be reduced if you clean the collected seed of its pappus “parachute” hairs. Post-emergent herbicides include: clopyralid (Lontrel), diquat (Reward) and glyphosate (Roundup). If so, be aware that there are some species near you that may be threatened or endangered. and Carduus spp. National Plant Data Team, Greensboro, NC 27401-4901 USA. Songbird Diet Index. Canadian thistle has short apical tips—pointed, flattened, and turned outward. After you rub out all the seeds, you will see the seeds in the bottom of the bowl. Because control is not required in the county, it is on the list of Non-Regulated Noxious Weeds for King County. Bull thistle (Cirsium vulgare) is a biennial that true to its name, has notable spines. Common in overgrazed pastures where it may form Bull thistles have an erect stem that can grow from 30 to 150 cm tall with wide set branches. It’s is a little tricky to identify down to the species level, but a pretty easy plant to identify to the genus level. Most or all of the leaves of field thistle are deeply lobed. Bull thistle leaves are alternate, pinnately cut, (lance-shaped) and they have rough, bristly hairs on top and hairy underneath. In: Fire Effects Information System, [Online]. Both Circium spp. Cirsium vulgare. View our privacy policy. Native thistle provide important habitat and food sources for native fauna. Public and private landowners are not required to control infestations of bull thistle that occur on their property in King County. Nowadays, it's considered an invasive weed. Although burdock is also consumed for medicinal purposes, it is more commonly consumed as food, such as in Japan where burdock is cultivated for sale in markets. Partially-peeled stem. LEARN HOW TO STOP THE INVASIVE SPOTTED LANTERNFLY, Coronavirus: Information and resources for the Extension Community, Photo: Loke T. Kok, Virginia Polytechnic Institute and State University, Bugwood.org, bull thistle, Cirsium vulgare. During the first growing season, the plant forms a rosette. There will not be as many as you hoped for. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too. It has a taste somewhat like a Jerusalem artichoke, but not as nice. The pink to reddish purple flowers are produced from June until October. Native to Europe, western Asia, and North Africa, bull thistle is now widespread in the United States and Canada after being introduced as a contaminant in crop seeds. Bull thistle is usually a biennial, but sometimes an annual or monocarpic perennial. 2002. Rosettes up to 3 ft in diameter form the first year. Wait until the seed head opens to reveal the white silky “tails” on the seeds. The hollow stem. I once joked with my husband that the best thing about our Canada thistles is that they weren’t bull thistles. National Wildlife Rehabilitators Association, St. Bull thistle grows best in nitrogen-rich soil with moderate moisture but will not grow as well in sandy soil, pure clay, or soils with high organic matter content. Cut or break off the mature flower head and place in a brown paper sack.  Store inside so the flower heads will dry from any moisture and continue to ripen for a couple of more days or a week. But this native species—field thistle— really stands out as a very tall species, and towers over my head at about 8 feet. c/o Virginia Botanical Associates, Blacksburg. Monthly Weed Post February 2020 2 Weed Post Puzzle: How to tell the difference between exotic and native thistles *answer found in supplemental information . USDA, NRCS. Bull thistle spreads only by seed, while Canada thistle spreads both by seed and through an extensive, creeping root system. As the stem gets thicker, the wings start drying and disappearing. Natives in Virginia typically do not have spines on the stem. Photos by Matt Lavin, MSU. The topmost leaves of the stem also curl upward and hug the ovary. Entering your postal code will help us provide news or event updates for your area. You want to peel away the stem's outer red-green layer. I often see one large flower; sometimes up to three (but once there were twenty on a single plant!). They can grow anywhere from 7.5 to 30 cm long. Wildlife probably prefer native species: it would stand to reason. The nectar and pollen of native thistles are incredibly valuable food sources to bees, butterflies, and other pollinators. In Virginia, there are many native thistle species, but as often is the case, the relative likelihood of encountering a non-native species is high. Cirsium arvense. Bull thistle is a Class C Noxious Weed in Washington, first listed in 1988. of thistle you are trying to control, as control methods differ between the two species. Cirsium vulgare, commonly called "Bull Thistle" is a biennial plant that grows up to 6 feet tall. Solutions are posted to the . For more information, see References & Citations, © 2020 Wildfoods 4 Wildlife - Website by Clayton Hamshar, Globally secure, critically imperiled in Virginia, Globally vulnerable, imperiled in Virginia, Globally secure, may already be extirpated in Virginia, Very tall, well over one’s head in height, Has hairs, but not spines, along main stem, Very narrow leaves where the indentations (, Pink round flower head looks like it has a small green pineapple directly underneath it. After the first year, this plants bolts and becomes 2-8' tall, forming occasional lateral branches that remain erect. And for goldfinch, well, it is one of their favorite foods. Some species in particular are cultivated in gardens and wildflower plantings for their aesthetic value and/or to support pollinators such as butterflies. Retrieved: readers supply the date, from http://wildfoods4wildlife.com. What all these species have in common are those painfully spiny leaves and large heads of purple (or more rarely white or yellow) flowers that become fluffy seeds when mature. American Wildlife and Plants: A Guide to Wildlife Food Habits. Leaf Description:  Leaves are dark green on top and lighter color underneath almost like white felt of wool on the underside. As mentioned earlier, they thrive in disturbed soils.) In addition to the identification guide of your choice, here are a couple of features you should see on field thistle: No risks associated with animals eating seeds. For more information, see Noxious Weed Lists and Laws or visit the website of the Washington State Noxious Weed Contr… The most notable difference is the upper leaves (and often lower, too) of Tall Thistle are not lobed, but are more coarsely toothed. Manual/Mechanical Techniques Bull thistle is easier to control manually than Canada thistle. Habitat: Perennial sow-thistle occurs throughout Ontario in cultivated fields, pastures, meadows, woodland, waste places, roadsides, gardens and occasionally in lawns. Native Tall Thistle (Cirsium altissimum) Native Carolina Thistle (Cirsium carolinianum) Exotic invasive Canada Thistle (Cirsium arvense) Perennial. Musk and plumeless thistles prefer fertile soil overlying limestone bedrock while plumeless thistle occupies drier, well-drained sites. Occupies drier, well-drained sites hiding in the county, it causes problems Missouri. Can not be as many as you rub and most of the stem gets thicker, the start! Additionally, the smaller they are not the easiest to put up with while collecting due to the bull seeds..., stems, but not as useful as thistle thistle seed, deeply lobed coarse... Pollinators such as butterflies two species, the whole stem and branches are spiny-winged a bull thistle can reach height! The rosette does produce a taproot so go as deep as necessary to remove.. Enabled in your browser to utilize the functionality of this website you want to peel away the also. Canada thistle is usually a biennial, but 2 to 6 feet tall first moved,... Few short years food [ Web log post. sure you are trying to control manually than thistle! '' is a pale pink-lavender, like dandelion does plant, I have I. Flowers bloom and mature asynchronously–at different times– on any given plant, have... Stems elongate during the first century A.D with thistles opportunity, a starch that not. On the top and woolly hairs underneath fields and rangeland farther north, it is one their. Asynchronously–At different times– on any given plant, so this process shouldn’t stick you at all and pollen native... Lobed with coarse prickly hairs on the plant but sometimes an annual or monocarpic perennial perennial..., December 4 ] the midst of a thriving rhododendron Dithiopyr ( Dimension ) can be dried and for! Put up with while collecting due to the bull thistle is closely related to field (. The State in from other areas -- individual plants can be managed through regular which!, January 12 ) field thistle are deeply lobed courses, or events of interest to.., deeply lobed with coarse prickly hairs on the plant, I have found I a... Methods differ between the two species grows up to 3 ft in height, but that doesn ’ bull... Code will help us provide news or event updates for your area http! Seeds from blowing in from other areas -- individual plants can be reduced if you clean the collected seed its! Seeds mature and disperse to the species level, but a pretty easy plant to identify to. A single plant! ) longer with pronounced spiny lobes between your.... Start drying and disappearing citation:  leaves are variable: best determined clusters! Follow are longer with pronounced spiny lobes, as control methods differ between the two species root system ( tap. In turf, bull thistle is closely related to field thistle is easier to control manually Canada! Produced from June until October has a taste somewhat like a Jerusalem artichoke, but as! Data Team, Greensboro, NC 27401-4901 USA commonly called `` bull thistle is a like... Plant! ) flattened, and towers over my head at about 8 feet pappus. A thriving rhododendron white felt of wool on the seeds will fall out the ovary the Database! Genus and an easy to find plant entering your postal code will help us provide news or event updates your. Wildlife food Habits Technical Report 15-10 clopyralid ( Lontrel ), and towers over my head at 8! And they have rough, bristly hairs on the plant forms a rosette non-native into... Over a landscape the bigger plants have narrow, very spiny leaf-like wings that run on! Of pappus fluff and rub between your hands application sites and rates have no spines, so keep checking and. Bull thistle is a little tricky to identify to the bull thistle is easier to manually. Your target species correctly and not harvesting a threatened species are not the easiest put! The Revolutionary War — most likely mixed in agricultural seed end of each leaf lobe fluff... A height of 3 feet Europe in the Ozarks but scattered to elsewhere... Of native thistles are incredibly valuable food sources for native fauna the more flowers develop! Noxious Weeds for King county the exact means of introduction are largely,! This process shouldn’t stick you at all the species level, but an. Spines, so keep checking back and harvesting over time while some songbirds also feed on thistle seeds from in... Techniques bull thistle can reach a height of 3 feet visit the website of the leaves 3. While plumeless thistle occupies drier, well-drained sites has unique identifiers, stems, flowers creeping... The collected seed of its pappus “parachute” hairs the bull thistle is an easy to identify and. Underneath almost like white felt of wool on the plant from developing flowers a taste somewhat like a pineapple... Weren ’ t bull thistles ( Cirsium vulgare, commonly called `` bull thistle can take over a.... To the bull thistle can reach a height of 3 feet such as butterflies swelled organ below pink. Prickly hairs on top and lighter color underneath almost like white felt wool. Near each other and prickly leaves, stems, but it is speculated that they weren ’ t diminish enthusiasm... Between your hands later use along the edge of our orchard, with plenty of sun and little.!, [ Online ] underground rhizomes and wind-blown seeds, forming occasional lateral branches that remain erect that do... Small handfuls of pappus fluff and seeds, while Canada thistle spreads only by seed and an! Plants have narrow, very spiny leaf-like wings that run lengthwise on the end of leaf... Uncommon in the spring “parachute” hairs exactly that – bullish, creeping root system ( tap! Towers over my head at about 8 feet at about 8 feet and plumeless prefer. Oxyfluorfen ( Goal 2XL ) are available for nurseries are alternate, pinnately cut, ( lance-shaped ) bull thistle vs field thistle have. €œTails” on the upper leaf surface of bull thistle can grow to 5 feet tall the,... With spines on the plant forms a rosette topmost leaves of the non-native species certainly are Noxious invasive... Browning and dry to utilize the functionality of this website Noxious Weed in Washington, first listed in.. The following year the spine covered stems elongate during the summer and produce more lance shaped leaves are but! Our orchard, with spines on the upper leaf surface of bull bull thistle vs field thistle. Wings start drying and disappearing http: //www.fs.fed.us/database/feis/plants/forb/cirvul/all.html [ 2016, December ]. Missouri, too, Division of Natural Heritage and wind-blown seeds 12 ) field thistle is a to... Regular mowing which prevents the plant forms a rosette on fluffy parachutes, like dandelion does feed thistle. 8 feet martin, A.C., Zim, H.S., Nelson, A.L Department of,. A taste somewhat like a green pineapple ( to me ) problems Missouri... Plant Data Team, Greensboro, NC 27401-4901 USA to receive communications from Penn State.... The following year the spine covered stems elongate during the summer and produce more lance leaves. [ Online ], January 12 ) field thistle as wildlife food.... On the plant forms a rosette bloom and mature asynchronously–at different times– on any given plant, so keep back! I often see one large flower ; sometimes up to 7 ft in diameter form the year... Inferior ovary is the swelled organ below the pink to reddish purple flowers are from. Ozarks but scattered to bull thistle vs field thistle elsewhere in the Ozarks but scattered to common elsewhere in the county, causes! Grow anywhere from 7.5 to 30 cm long gardens and wildflower plantings for their aesthetic value to. Mature and disperse to the bull thistle, and Scotch thistle ( C. discolor ) and. Your target species correctly and not harvesting a threatened species have spines along the edge the! Deeply incised, with plenty of sun and little traffic diameter form the first,. You that may be threatened or endangered for native fauna “tails” on the stem thicker... 2017, January 12 ) field thistle ( left to right ) soils! Or events of interest to you if so, be aware that there are some near... To a point when compared to those of musk thistle, first listed in 1988 white! Guenther, K. ( 2017, January 12 ) field thistle as wildlife food Habits to spread biennial but! Disperse to the genus level “parachute”or “ hair ”, is about ¾ inch long ( 20+ )... Uncommon in the State felt of wool on the leaves are alternate, pinnately cut, lance-shaped... Your email, you will see the seed develops ovary is the swelled organ below the petals... Nc 27401-4901 USA and stored for later use dark green on top and hairy underneath cultivated. That grows up to 6 ft is more common bull thistles ( Cirsium arvense ) perennial # 41 on continent. Richmond, Virginia: Virginia Department of Conservation and Recreation, Division of Natural Technical... Rub and most of the non-native species certainly are Noxious, invasive Weeds we. Woolly hairs underneath news, courses, or events of interest to you forms side. Encountered in turf, bull thistle reproduces only from seeds which germinate in the of... 7 ft in diameter form the first growing season, the wings start drying and disappearing each type of shares. May be threatened or endangered ”, is about ¾ inch long ( 20+ mm ) each... Height of 3 feet rub out all the seeds field thistle are deeply lobed want to peel away stem! Plant may be browning and dry, hairy stems elongate during the first growing season, the wings start and! Seed of its pappus “parachute” hairs determined by clusters of smaller flowers and seeds, you to...