Bull Thistle is a biennial plant in the Asteraceae (daisy) family that is native to Europe to Siberia, and the Arabian Peninsula. (ncsu.edu)
Populations of bull thistle tend to be short lived, establishing after disturbance, dominating for a few years, and then declining as other vegetation recovers. (ncsu.edu)
Bull thistle prefers sunny, open areas. (ncsu.edu)
Cirsium vulgare, the spear thistle, bull thistle, or common thistle, is a species of the Asteraceae genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains). (wikipedia.org)
Marsh thistle, Cirsium palustre, was ranked in first place while this thistle was ranked in sixth place. (wikipedia.org)
Flora of China, 翼蓟 yi ji, Cirsium vulgare (Savi) Tenore Flora of North America, Bull or common or spear thistle, gros chardon, chardon vulgaire ou lancéolé, piqueux, Cirsium vulgare (Savi) Tenore Atlas of Living Australia, Cirsium vulgare (Savi) Ten. (wikipedia.org)
Black Thistle Conservatoire et Jardin botaniques & South African National Biodiversity Institute, African Plant Database, Cirsium vulgare (Savi) Ten. (wikipedia.org)
One of the worst invasive pests here is Cirsium vulgare or Bull Thistle. (nargs.org)
Bull thistle (Cirsium vulgare) is easy to identify by the bushy appearance with deeply double toothed leaf margins and very prominent hard spines. (msucares.com)
Bull thistle tends to flower later than other thistles from June to September. (msucares.com)
Although bull thistle seeds can germinate easily, seeding survival is very low. (msucares.com)
Blessed thistle (Cirsium vulgare) is an annual thistle that can grow up to 2 feet. (msucares.com)
Bull thistle is a biennial forb that was introduced to North America as a seed contaminant and is now widespread. (colorado.gov)
As in other species of Cirsium (but unlike species in the related genus Carduus), the pappus hairs are feathery with fine side hairs. (wikipedia.org)
Any of several perennial composite plants , especially of genera Cirsium , Carduus , Cynara , or Onopordum , having prickly leaves and showy flower heads with prickly bracts . (wiktionary.org)
In Colorado, Bull thistles are the only species that are prickly hairy on the top and are cottony-hairy on the undersides of the leaves. (colorado.gov)
Genus1
Members of the genus Cirsium support the following specialized bees: Melissodes (Heliomelissodes) desponsus, Osmia (Helicosmia) chalybea and Osmia (Helicosmia) texana. (ncsu.edu)
Arvense3
A number of thistle species are on the Kansas noxious weed list, including bull thistle ( Cirsium vulgare ), Canada thistle ( Cirsium arvense ), and musk thistle ( Carduus nutans ). (dyckarboretum.org)
Canada thistle (Cirsium arvense) is a persistent perennial weed that causes significant crop yield losses.It reproduces through both seed and root regeneration, but the latter is the most successful. (ibase.com.sg)
Additionally, native thistles are noticeably less prickly to weedy or non-native thistles like Bull Thistle (Cirsium vulgare) or Canada thistle (Cirsium arvense). (ibase.com.sg)
Thistles4
Bull thistle tends to flower later than other thistles from June to September. (msucares.com)
The native species, undulating thistle ( Cirsium undulatum ) and tall thistle ( Cirsium altissimum ) are the only thistles I have found on most South Central Kansas prairies I visit. (dyckarboretum.org)
The leaf undersides of the bull thistle are light green or whitish green, while the leaf undersides for some native thistles, such as Cirsium discolor (pas- ture thistle) and Cirsium altissimum (tall thistle), are powdery white in appearance. (skymeadows.info)
Thistles Seeds Cirsium texanum (flowers if first year) pumilum var hillii (three inch flower heads) discolor Field Thistle (can reach 10' tall) (In the Midwest, ruby-throated hummingbirds (Archilochus colubris) commonly visit native field thistle for nectar. (ibase.com.sg)
Asteraceae1
Cirsium vulgare, the spear thistle, bull thistle, or common thistle, is a species of the Asteraceae genus Cirsium, native throughout most of Europe (north to 66°N, locally 68°N), Western Asia (east to the Yenisei Valley), and northwestern Africa (Atlas Mountains). (wikipedia.org)
Biennial1
Bull thistle is a biennial growing into a rosette with large, fleshy, coarsely-toothed spiny leaves. (onetwotree.com)
I'm not certain on the species, but I believe this is Cirsium vulgare , commonly referred to as Bull Thistle. (showmenaturephotography.com)
Seeds1
Although bull thistle seeds can germinate easily, seeding survival is very low. (msucares.com)
Plant2
Around here it's not too hard to find a thistle plant, and our main variety is common Bull Thistle (Cirsium vulgare). (practicalselfreliance.com)
This thistle plant I'm testing is a bull thistle, and the spines are huge and rigid. (practicalselfreliance.com)
Spiny1
Bull Thistle is a spiny and common purple wildflower in Alberta. (birdwatchinghq.com)
Tall1
Given the opportunity, a bull thistle can grow to 5 feet tall, and send out multiple flower stalks. (practicalselfreliance.com)
Spines1
Bull thistle (Cirsium vulgare) is easy to identify by the bushy appearance with deeply double toothed leaf margins and very prominent hard spines. (msucares.com)
Grow1
Blessed thistle (Cirsium vulgare) is an annual thistle that can grow up to 2 feet. (msucares.com)
Flower1
The answer to last week's mystery is the flower head of bull thistle, Cirsium vulgare, pictured in photo #2. (chestertownspy.org)
Found1
I found some Bull Thistle (Cirsium vulgare) a couple days prior, and knew the general area of which to find them, but I was unable to locate the plants in all the greenery when I went out. (blogspot.com)