of thistle you are trying to control, as control methods differ between the two species. The three most common invasive thistle species are: Canada thistle, bull thistle, and plumeless thistle. Kelli Durgan. 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. Noting these differences is vital when using proper extraction methods. This thistle doesn't have the milky striping, and its leaves are hairier than Italian or milk thistle. ... "This article helped by telling me how I can control bull thistles." Chemical: Follow labels exactly as written and only use products appropriate and legal for the site. Rated this article: More reader stories Hide reader stories. Bull Thistle Control Practices. Keep it luscious. This video demonstrates the precision foam herbicide system from Green Shoots. POSTEMERGENCE HERBICIDES FOR CONTROL OF BIENNIAL THISTLES. 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. Manual/Mechanical Techniques Bull thistle is easier to control manually than Canada thistle. Wheeler’s thistle plants are shorter and smaller with more delicate stems and rosettes. Cultural Control Practices. Bull thistle (Cirsium vulgare) is a biennial with erect stems from a fleshy taproot.Leaves are alternate, hairy, … While scouting, you may encounter tall thistle, Le Conte’s thistle, swamp thistle, Nuttall’s thistle, purple or yellow thistle, bull thistle, Virginia thistle… The other is Canadian Thistle (Cirsium arvense), a perennial. S. C. Apr 9, 2016 "A good, informative article." The system creates a foam herbicide that sticks well to plant surfaces. The stems do not have spiny wings and therefore can be easily touched. Apr 25, 2017 "It was a great help." 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. Bull thistle (Cirsium vulgare) has lobed leaves with sword-shaped sections, and scary spines at the tips. Hand Pull Young Bull Thistle. Cut down the thistle to its base to stress the roots. Although there are at least nine different species of thistle in Florida, most are closely related and control recommendations will not differ. The best time to treat biennial thistles with herbicides is in late fall or early spring when the rosettes are present but before flowering stalks are initiated.Musk thistle and bull thistle plants with seed stalks are more difficult to kill than the rosettes. It has spiny-winged stems, and its flowers are classic onion-shaped thistle flowers. The control of bull thistle shall mean preventing the production of viable seed. Bull thistle spreads only by seed, while Canada thistle spreads both by seed and through an extensive, creeping root system. 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. Minnesota has many varieties of thistle species, some are native and others are invasive. The leaves are not covered in bristles or bumps like bull thistle. The best way to avoid thistle is to keep your lawn thick and lush. Mow cleanly and closely and repeat as needed for control. All three are identified by the bright purple flowering head, each with a different inflorescence. Control strategies: Eradicate them in rosette stage in the first year whenever possible. 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. 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