Use glyphosate for your garden, and use a broad-leaf herbicide containing 2,4-D or MCPP for your lawn. Perhaps one of the most noxious weeds in the home garden, Canada thistle (Cirsium arvense) has a reputation for being impossible to get rid of.We won’t lie to you, Canada thistle control is difficult and requires a significant amount of effort to be successful, but the effort you put into controlling Canada thistle will pay off when you have a garden that is free from this annoying weed. 4 users answered this survey. The herbicide will prevent the thistle from getting the nutrients it needs to survive. While there are several herbicides that are effective on large, bolted thistle, the spring forage response will be decreased the later you wait to spray. 50% of users selected Southern Ag, 25% selected PBI/Gordon 652400, 25% selected RM18 Fast-Acting, 0% selected Image 100099405 and 0% selected Gordon QT Trimec. Steven McDonald, M.S. Sometimes one treatment isn’t enough to kill off the thistles. FOR BEST RESULTS • With Grazon Extra, ensure you spray the entire ... HERBICIDES FOR THE CONTROL OF THISTLES The first application of herbicide typically happens between March and May when the thistle rosettes appear. The higher herbicide to water mix ratio is appropriate for more intense infestations or if you are spraying the weed on the boundaries of the recommended spray timing. But it also takes out especially tough-to-control broadleaves, including wild carrot, giant hogweed, wild parsnip, plantain, poison hemlock, the sunflower and aster families, and common caraway. This causes the thistle to slowly die. Even after multiple herbicide applications, Canada thistle can survive for years. Customer’s Choice: the Best Rated Herbicides for Thistles. Minimally mowed rough areas (also referred to as no-mow areas, secondary rough areas or … Apply herbicides to kill thistle, especially in spring and fall, before thistles can flower and seed. Since glyphosate kills all plants, you must keep application specific. As the injuring the trees with broadleaf herbicides through root thistle is stocking up its root reserves for the winter, it will absorption. Please help us improve this review! Re-apply the herbicide if thistles reappear in the plot. 5. Canada thistle control with selective herbicides Canada thistle is an invasive weed that poses a problem in minimally mowed rough areas. Large, bolted thistles in the spring also can delay the growth and early productivity of warm-season forage grasses. ¾Use less chemical – 3 to 7 ounces per acre/year ¾No known toxicity to animals ¾Excreted from grazing livestock as an active chemical ¾Can be used up to the waters edge Do not apply directly to water thistle's root system because systemic herbicides move plantings, spot treatments using glyphosate reduce the risk of through plants with the sugars being sent to the roots. Thistle seedlings have bristles or spines on their leaves, so as soon as you notice a seedling, pull it out before the roots are well established. Canada thistle is a perennial noxious weed that’s particularly troublesome because it can spread by both seed and root shoots. ¾Yellow starthistle, all other thistles, fiddleneck, ragweeds, etc… Check the label for a complete list. DuraCor kills all the troublesome rangeland and pasture weeds — thistles, ragweeds, pigweed and others. Dan Loughner, M.S. 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