Every winter, the foliage dies off, but the creeping root system is still alive underground. Glyphosate, such as: Roundup ProActive; Roundup ProVantage; Gallup Biograde; These will have a good effect on young thistle seedlings but it is unsuitable for paddock situations where a selective herbicide is much preferred. This particular solution can be used on driveways, sidewalks, patios, flower and vegetable gardens, mulch, and other landscaped areas, making it a versatile solution for all your weed-removal needs. Digging up the plants can be done at any time of year. Scotch and Illyrian thistles are often confused with each other and are sometimes identified as the same species. Post-emergent herbicides control existing weeds, and they can be systemic or non-systemic. I buy the 2 1/2 gal jug of the Pro Concentrate for about $65 online. These include restrictions on use near groundwater and on the season of use. Thistles are one of the most stubborn weeds, so they can be really tricky to kill. New infestations are easier to manage than large-scale populations. Usually, this happens in the fall as plants store energy and in the springtime of the year when plants break dormancy. 788 sold. Roundup Weedkiller is the worlds best selling weedkiller used by gardeners everywhere. Homemade cookies are always a welcome treat. glyphosate . Can cause stock poisoning. As with all perennial broad-leaved weeds, Thistles are best controlled with Roundup just as they come into flower and before seed set or senescence. Perhaps the best time to spray thistles is in the early fall, when temperatures are still in the 70s F. Nearly all of the plants will be in the rosette stage and actively growing. According to Roundup's website, both the Roundup … What is the best weed killer for Thistles? Bio-logical control might be used exclusively in remote or environmentally sensitive areas with large thistle populations. This weed is best sprayed with Thistlex, Forefront, Lupo, MCPA or 2, 4-D in June before flowering and may need a second treatment later in the season to control any late shooting thistles. Systemic herbicides work by moving through plants to their roots, and they're most effective when the plants are actively growing. The best time to apply weedkillers to thistles is when they are growing vigorously, but have not yet flowered. They can be poorly controlled in the spring, not only because of protracted emergence of … fall Roundup Pro 128 Roundup Pro (glyphosate) is non-selective, and this rate will severely injure all contacted vegetation. Some weed killers work best when applied at certain times of day, but for others timing has little or no effect. Control with Roundup. Musk thistle and bull thistle plants with seed stalks are more difficult to kill than the rosettes. This product may only be used from 15 April to 15 Sept unless permitted by the Registrar of Chemical Products, DPIPWE. Shop from the world's largest selection and best deals for Roundup Weedkiller 5l. Non-weedkiller control. Thistle rosettes need to be treated when they are actively growing and not under drought stress. However, Roundup is effective throughout the season against plants. Because of this, using an herbicide that penetrates the foliage of the thistle and works its way down to the roots to kill it is one of the best methods to eradicate thistles once and for all. The RoundUp Ready-to-Use Weed and Grass Killer is a great multi-purpose weed killer to use around your home. Dense thistle populations can reduce property values. BEST ANSWER: RoundUp Pro Weed Killer appears to be the same as RoundUp Pro Concentrate. Thistledown is a selective herbicide (Clopyralid 40.9%) for post-emergent control of broadleaf weeds in rangeland and permanent grass pastures. 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