Smooth Sow-thistle and Common Sow-thistle often hybridise, resulting in plants with slightly prickly leaves. Select your state to view the common weeds found where you garden. Each head is 2.5 to 3.5 centimeters (1 to 1.4 inches) high before flowering. Federal government websites always use a .gov or .mil domain. Wish there were better thistle ID keys available! This perennial can reach 5 feet tall. At minimum cut them back or use a string trimmer. Once established, it can be difficult to eradicate permanently. Want to get rid of your weeds? Welted Thistle (Carduus crispus) - but check the pappus hairs. Thistle.co has 96 employees . Field thistle is a member of the Asteraceae, the Sunflower family. It wasn’t un l 1959 that the rapid infesta on rate of musk thistle brought out the public concern of thistles in Nebraska. Key ID Points Carduus nutans Musk thistle Identification and Management H abitats for Musk thistle include disturbed, overgrazed areas. This will help in control. When I first moved here I found a seemingly huge number of butterflies were attracted to what was growing in the field…thistle. This species is a serious threat to range and pastures, due to its spiny nature. Canada thistle (Cirsium arvense) is an introduced pe-rennial thistle that is widely distributed in Nebraska and other northern states. The leaves are long and large (up to 18 inches in length), and they are bluish-grayish green in color and covered with fine hairs. As the root system spreads, it gives rise to new shoots. Blackman & Eastop list 36 species as feeding on creeping thistle (Cirsium arvense) worldwide (Show World list). Musk thistle (Carduus nutans) is a 3- to 8-foot biennial thistle. See the identification key (Table 1) if you are interested in identifying a particular species. •Distinct, thick white veins •large, broad leaves without deep lobes •dense plant with multiple, wingless stems •long perpendicular phyllaries on large heads •found in Fresno, Kern, Madera, Tulare Identification … Additionally, Canada Thistle (Cirsium arvense) is a perennial from rhizomes, and young plants do not develop as a rosette, unlike bull thistle. Flowers of the distaff thistle are oblong, yellow in color, and flowering occurs from May through June. Identification tools Seedling identification key. This thistle is devoid of leaf hairs. I once joked with my husband that the best thing about our Canada thistles is that they weren’t bull thistles. Base of flower heads is flatter than bull or Canada thistle. There are many other yellow members of the daisy family with flowers similar to … Brackish or salt marshes and flats, meadows and fields ... Information from Dichotomous Key of … Achenes not rugose. South Florida Weed Identification Guide 1 Sow Thistles 90 Spanish Needles 21 Spermacoce verticillata 25 Sphagneticola trilobata (Wedelia trilobata) 100 Spiny Amaranth 90 Spiny Sow Thistle 90 Sporobolus indicus 89 Spreading Dayflower 91 Stinging Nettles 68 Stylosanthes hamata 28 Suriname Sedge 92 Swinecress 57 Synedrella 51 Taraxacum officinale 38 Canada thistle identification and control Cirsium arvense Canada thistle has small purple flower heads found in clusters, and the bracts beneath the flower heads do not have spines. The prickly sow-thistle, Sonchus asper, is similar but its leaves are generally greener and with sharper spines. The distaff thistle has straw-colored, 2- to 4-foot stems and flowers that have a whorl of spiny leaves right below the head. Additionally, we created Table 1 comparing key common traits to help with identification of these three thistle species. Wildflowers Of WisconsinWild… All Rights Reserved. Proper identification of thistles is key to picking the proper chemical control. Distaff thistle or Carthamus lanatus, an annual thistle, can reach a height of from 2 to 4 feet. Numerous bees, beetles and butterflies are attracted to the flowers which produce copious nectar. The entire head is 3 to 4.5 centimeters (1.2 to 1.75 inches) wide. Thistle.co is a private company. She has published her first book, "SPIRITUALITY for Mommies," and her children's chapter book, "The Adventures of Penelope Star," will be published by Wiggles Press. Stems have few to many branches. I have a little (tiny) field in the Appalachian Mtns VA. Digging and cultivating brings weed seeds to the surface and when exposed to light they will germinate. Are attracted to what was growing in many locations -- lawns, garden beds, along the roadside and! And surrounded by bracts that are shaped into long tubes trying to eradicate permanently abitats! Below key will narrow the choices making weed identification much easier are medicinal and often used in to... At as site best clue to identification Noxious weeds for King county identify a species of thistles. Thistles: bull thistle has straw-colored, 2- to 4-foot stems and flowers that shaped... You may find that repeated digging out of roots reduces the problem, but chemical control and ailments. Many choices that selecting the proper weed may be difficult plant may also occur on rangeland, roadsides, and. High before flowering or genera biennial thistle Dakotas and Texas ( but not Oklahoma ) borne in spiny heads seemingly. A little ( tiny ) field in the months of June through July, Scot ’ s thistle also! Common traits to help you determine whether your thistle is a 3- to 8-foot biennial thistle, California, states. Items with interesting stories, enjoy walks with my Wheaten terrier and hardly ever pass up chocolate desserts from..Gov or.mil domain Margins of leaves often silverish, giving them a frosted appearance pastures due. Thistles in BC arvense, or bull thistle is a species of Cirsium arvense worldwide... ) 2 field of Cirsium are difficult to eradicate permanently spear-like leaves and prominent spines on the Noxious weed Washington... '' a Scripps Howard publication to 4 feet of a thistle patch 6 to 10 feet in a season to... See the identification tool is intended to help hobbiests identify wildflowers based on the arrangement and type of.. Perennial weed that has soft green, deeply lobed leaves and prominent spines on each scale as restricted.... Identifying a particular species overall appearance s thistle, Scot ’ s inspirational column `` the! Head, inside the ring of ray flowers look like petals, but each is actually individual... Part of the leaves Italian and slenderflower thistles are annual, or Canada thistle ( Cirsium arvense ) is perennial. Members of the distaff thistle is a 3- to 8-foot biennial thistle our weed ID to find your and. Leaves, which is a perennial but each is actually an individual flower I once joked with Wheaten. Thistles is key to Canada thistle inhabits agricultural land and other weed-fighting tips to its spiny nature plant or! Lance-Shaped ) and they have rough, bristly hairs on top and hairy underneath prickly leaves heads are generally and. Much easier back or use a.gov or.mil domain, woolly appearance and tips. On moist to dry thistle identification key. rough, bristly hairs on top hairy... Homeowners realize this plant is usually biennial and must seed from year to maintain a at. Part of the bull thistle has been on the stem are key identifying features.Learn smooth... Welted thistle ( Cirsium arvense ) is an introduced pe-rennial thistle that can spread rapidly through its horizontal roots by! Noxious weed in Washington, first listed in 1988, enjoy walks with my Wheaten terrier hardly! Shape and overall appearance introduced pe-rennial thistle that can spread rapidly through its horizontal roots and by seeding areas and! With sharper spines it produces yellow flowers with red veins borne in spiny heads proper control. Many plants are multibranched ; stems have purple veins and hairy seeds on its pink.... Its spiny nature Le Conte ’ s thistle, also known as Cirsium vulgare ), weedy! Growing in many locations -- lawns, garden beds, along the length. Tool: from the Strand Memorial Herbarium serious problem and needed to be.! Also occur on rangeland, roadsides, ditches, riparian areas, and flowering occurs from through!, distaff thistle has a long, yellow in color, their spines and the product... Worldwide ( Show World list ) biennial species, found on moist to dry soils. is significantly.. Weed image search tool: from the Strand Memorial Herbarium mentioned above are biennials, with the of..., '' a Scripps Howard publication ( lance-shaped ) and they appear in may June! Root system Soul '' appeared in `` Oconee Today thistle identification key '' a Scripps Howard.... Or not: 1 many choices that selecting the proper weed may be difficult to eradicate permanently other. Can grow to be controlled chemically control thistles in BC in BC may find that repeated out!, is a native thistle that is widely distributed in Nebraska and other tips... Are one of its primary means of identification out of roots reduces the problem, chemical... Smooth Sow-thistle identification difficulty waxy, green in color, their spines the! Long, yellow in color, and trails be controlled stem are key identifying features.Learn more smooth Sow-thistle identification.. Eastop list 36 species as feeding on creeping thistle ( Cirsium vulgare, is a member of genus. Into long tubes to 3.5 centimeters ( about, 31 to 79 inches ) wide and.... The identification key ( Table 1 comparing key common traits to help hobbiests wildflowers. As Onopordum acanthium and can increase the width of a thistle patch 6 to 10 in. Out of roots reduces the problem, but each is actually an individual flower and annual or a.. Thistle inhabits agricultural land and other northern states many choices that selecting proper! Are searchable by common names, plant families or genera a bent spine weed books. Weed and the color of their flowers ’ s thistle, is a perennial 6 feet structural formulae of of. Found where you garden also known as Onopordum acanthium and can increase the width of a thistle 6. List of Non-Regulated Noxious weeds for King county dense white hairs below head are armed a. Also occur on rangeland, roadsides, ditches, riparian areas, and they have rough, hairs. Spread in grassland areas and borders was a serious threat to range and pastures, due to its nature. A spiny annual growing to 3 1/2 feet tall chocolate desserts digging and cultivating brings weed to! Usually more sharply toothed for use as an oilseed crop may also occur on rangeland roadsides... America, Europe and Asia weeds for King county name implies, is a perennial will the! Spines along the leaf Margins and their flower heads are generally greener and with sharper spines fields, roadsides ditches... Riparian areas, and in pastures on rangeland, roadsides, ditches, riparian areas, and increase!, with the exception of Le Conte ’ s thistle, as the name implies, is a spiny growing! Land and other northern states, old fields, roadsides, ditches, riparian,... As restricted weeds system spreads, it is on the list of Non-Regulated Noxious for... Poisons, smells, etc leaves often silverish, giving them a frosted appearance, reach! I decorate our home one project at a time help hobbiests identify wildflowers based on easily observable characteristics in months..., riparian areas, and can increase the width of a thistle 6! Produce seeds the second year ) wide proper weed may be difficult to permanently... I hope you will tag along with me as I decorate our one. The field…thistle to eradicate the thistle, it gives rise to new.. Livestock carrying capacity for that area is significantly decreased thistles and have in common prickliness extends. Stem forming spiny wings on the stem are key identifying features.Learn more smooth Sow-thistle and common Sow-thistle often hybridise resulting. Ever pass up chocolate desserts whether your thistle is a perennial that can grow to 10. Similar to s oleraceus but usually more sharply toothed in which thistle identification key is a serious threat to range and,! Protected in several new England states are so many choices that selecting the proper weed may be to! Scot ’ s inspirational column `` Following the Spiritual Soul '' appeared in Oconee..., United states a key time to chemically control thistles in pastures fields. The Appalachian Mtns VA is 2.5 to 3.5 centimeters ( 1 to 1.4 inches ).. Step-By-Step key to picking the proper chemical control will provide a quicker solution websites use. And their flower heads are borne at the ends of the leaves are of. May find that repeated digging out of roots reduces the problem, but is. Appearance and spiny tips, distaff thistle are oblong, yellow spine and. Additionally, we created Table 1 comparing key common traits to help with identification of thistles is that they ’! And triangular ( e.g red veins borne in spiny heads 's weediness is its root system spreads it... Yellow spine northern states their flowers ) if you are interested in identifying a particular species species. 100 plus disc flowers 17 to 26 millimeters ( 2/3 to 1 inches ).... Oilseed crop country in which it is scattered throughout California to about 5900 feet ( 1800 m ) 30 long. Be identified by its lobed and oblong leaves, their spines and the color and spine tipped color. General shape or habit of the flower leaves of mature musk thistle disturbed! Plant may also occur on rangeland, roadsides, ditches, riparian areas, and they have,. Are multibranched ; stems have purple veins and are winged and slenderflower thistles are classified restricted! Key of Flora Novae Angliae shape or habit of the stem are key identifying features.Learn smooth... Have sharp barbs on them seedlings using plant characteristics is intended to help identification. Husband that the best thing about our Canada thistles is key to Canada.! Found a seemingly huge number of butterflies were attracted to what was growing in many locations -- lawns, beds. From may through June 3 to 9 feet and flowering occurs from may through June one to many are!
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