Bull thistle is a widespread biennial thistle originally from Europe and Asia, but now introduced throughout North America. The three most common invasive thistle species are: Canada thistle, bull thistle, and plumeless thistle. Exotic invasive Bull Thistle (Cirsium vulgare) Long silky hairs on Silver Plume Silver Plume blooms in September Virtually no hairs on Johnson grass SF 2016 (Cirsium discolor) Native Tall Thistle (Cirsium altissimum) Native Carolina Thistle (Cirsium carolinianum) Exotic invasive Canada Thistle (Cirsium arvense) Perennial. Bull thistle needs both soil moisture and excessive sunlight, making it most common on stream and lake margins in burned areas, developed areas such as campgrounds, and road crossings. The bulk of seed is produced on the upper branches, and germination may run as high as 95%. Bull thistle is a biennial thistle native to Europe. Bull thistles have earned the title of noxious or invasive in many areas. It occurs in all 48 contiguous states and most of Canada, but is designated noxious in only four states. Ontario Weed Gallery: Bull Thistle Ontario Vegetation Management Association Weed Control Act - R.R.O. The first year rosette is dark green and covered in spines. It grows throughout North America, and is considered an invasive species in pastures and forestland. In Australia bull thistle populations persisted for 4 years in grazed pasture but declined in ungrazed pasture, suggesting that grazing allowed bull thistle populations to thrive . Canada thistle (Cirsium arvense; invasive) does not have a winged stem or spines on its stem or flower heads. Although it is considered an invasive species and weed, the Bull thistle still contributes beneficial ecosystem services such as serving as nectar sources for pollinators such as honey bees (Apis spp. Caleb Slemmons, University of Maine, Bugwood.org. Jun 22, 2019 - This Pin was discovered by Alexis Woods. Bull thistle colonizes primarily in disturbed areas such as pastures, roadsides, and ditch banks as well as in hayfields, disturbed prairies and logged mountain areas. Figure 2A. Bull thistle is common in disturbed areas but is not a significant threat to well established native ecosystems. Bull Thistle More photo galleries ... Get news from the Invasive Species Council of BC delivered to your inbox. However, bull thistle mostly grows where soil has been disturbed, either … Thistle was once a revered plant and flower. It germinates in spring or fall as a response to soil moisture and is less sensitive to low water availability than other species of thistle. Common/Bull Thistle. Please click here to see a county level distribution map of bull thistle in Washington. Musk thistle and bull thistle have been listed as noxious weeds only in … Home Invasives Invasive Plants old page Bull Thistle. 1990, Reg. I collected ... Pollinators get nectar and pollen, but it is aggressively invasive. Bull thistle. They are distinguished from all other thistles by the covering of short, sharp prickles on the upper, ... Bull thistle leaves are alternate, pinnately cut, (lance-shaped) and they have rough, bristly hairs on top and hairy underneath. Cirsium vulgare Asteraceae/Compositae. 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). your own Pins on Pinterest 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. It is now the most widespread of the thistles in the United States (Figure 3, Bull thistle. It probably was introduced in eastern North America during colonial times, as a contaminant in seed or ship ballast. The plant grows 2 to 6 feet tall. The spiny, spreading, winged stems are up to 7 ft. (2.1 m) tall. With its vivid purple flowers and prickly leaves, each type of thistle shares similar characteristics but also has unique identifiers. Bull Thistle is a biennial plant, meaning it lives for two years, produces seeds and then dies. Although bull thistle does not generally invade undisturbed areas, it can … Most invasive thistles came from Europe in the 1600s. Bull Thistle’s Role in Healthy Soil Building. It resembles Plumeless Thistle ( Carduus acanthoides ), also a noxious weed, but its flowers are typically 1 inch across or less, leaves are mostly hairless on the upper surface, and is overall even spinier than Bull Thistle. Throughout the United states are largely unknown, but can live in a variety of conditions,... 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