biennial thistles

Is Musk Thistle Invasive Species? Musk thistle is an invasive species. Musk thistle colonizes in disturbed areas, such as pastures, roadside ditches, ditch banks, hayfields and disturbed prairies. … Livestock do not eat it, giving it a competitive edge against native species. Which thistles are invasive? Bull, musk, plumeless, and Scotch thistles are annual and