Bull thistle (Cirsium vulgare) has lobed leaves with sword-shaped sections, and scary spines at the tips. Bull thistle (Cirsium vulgare) is a biennial with erect stems from a fleshy taproot.Leaves are alternate, hairy, … Control strategies: Eradicate them in rosette stage in the first year whenever possible. Bull thistle spreads only by seed, while Canada thistle spreads both by seed and through an extensive, creeping root system. This thistle doesn't have the milky striping, and its leaves are hairier than Italian or milk thistle. As a biennial, Bull Thistle forms a small rosette just above ground level in its first year of growth, before developing a much more complex root system in its later years. Cultural Control Practices. Noting these differences is vital when using proper extraction methods. POSTEMERGENCE HERBICIDES FOR CONTROL OF BIENNIAL THISTLES. The best way to avoid thistle is to keep your lawn thick and lush. Bull Thistle Control Practices. All three are identified by the bright purple flowering head, each with a different inflorescence. The other is Canadian Thistle (Cirsium arvense), a perennial. Minnesota has many varieties of thistle species, some are native and others are invasive. Cut down the thistle to its base to stress the roots. The leaves are not covered in bristles or bumps like bull thistle. Chemical: Follow labels exactly as written and only use products appropriate and legal for the site. Bull thistle (Cirsium vulgare), originally from Asia, Africa and Europe, grows wild in all parts of the United States and is hardy in U.S. Department of Agriculture plant hardiness zones 2 through 10. Rated this article: More reader stories Hide reader stories. Although there are at least nine different species of thistle in Florida, most are closely related and control recommendations will not differ. S. C. Apr 9, 2016 "A good, informative article." ... "This article helped by telling me how I can control bull thistles." Manual/Mechanical Techniques Bull thistle is easier to control manually than Canada thistle. It has spiny-winged stems, and its flowers are classic onion-shaped thistle flowers. Weed Control in Pastures, Forages, and Hayfields. Kelli Durgan. The control of bull thistle shall mean preventing the production of viable seed. The system creates a foam herbicide that sticks well to plant surfaces. Apr 25, 2017 "It was a great help." The stems do not have spiny wings and therefore can be easily touched. Hand Pull Young Bull Thistle. Mow cleanly and closely and repeat as needed for control. Keep it luscious. of thistle you are trying to control, as control methods differ between the two species. Wheeler’s thistle plants are shorter and smaller with more delicate stems and rosettes. Bull thistle does not tolerate shade, so another cultural control option would be to plant tall grasses or other plants that would act to shade out the seedlings. Mowing - Mow with a rotary mower between the first appearance of color and the first appearance of brown on the pappus of the earliest heads. This plant often grows as a biennial. This video demonstrates the precision foam herbicide system from Green Shoots. 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. The three most common invasive thistle species are: Canada thistle, bull thistle, and plumeless thistle. 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