We have a lot of it and Scotch Thistle in our 2 acre field. Don't let thistle get to the stage in which the stems elongate and begin to produce flowers. Just to let you know, Katrina, cirsium arvense is actually called Canada Thistle, just like the geese, Canada Geese. Mechanical control: Mowed thistles will produce new branches from basal buds but close cutting or cutting twice per season will usually prevent seed production and reduce the population over time. The root is edible, and according to one source, it tastes “like burdock root only better.”While burdock stalks are delicious, I really can’t stand burdock root, and I think it tastes like bitter dirt.Thus, I’m not excited about cooking up a thistle root. Thistles in your garden can be sliced off with a hoe; cut them as close to the ground as possible. I have spent years pulling them, root and all, and lately they were cut down, along with the very tall grasses. The flowers should be cut before drying out. Start by cutting the thistles when they reach about 6 inches tall in early June right before the flowering stage. Spear Thistles they depend on wind dispersal of the seeds with the seeds usually falling to earth in the first Because of this intricate design, it’s critical to remove new thistle as quickly as possible, though this often requires the aid of a weed killer to do so. 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. Another tradition says that if you cut thistles in August when the Moon is in the sign of the heart (Leo), they will not return. When the main stem is bare I cut it off above the ground with a machete, there's a stob left about 6 inches tall. Cutting. Thistles will resprout readily if cut down, so it’s best to dig the whole plant up by the root. Or this one: Cut your thistles before St. John (June 24), And you will have two instead of one. Cut thistles in July, they’ll lay down and die. One great way to kill thistles … Mowing is generally less successful on deep-rooted perennial weeds and brush. Preventing seed production is of utmost importance when attempting to manage thistle populations. The old rhyme is, 'Cut thistles in May, they'll grow in a day/Cut them in June, that is too soon/Cut them in July, then they will die.' Weeds vary in their susceptibility to herbicides. Small rosettes can be removed by hand by cutting the plant below the soil surface to prevent regrowth. Too many nearby desirable plants will be killed. Thistle Root. Tall thistles should not be sprayed with weed killer. cutting can spread into a 20m patch in just two years. I'm cutting off buds with kitchen scissors, lopping off the big arms of these thistles which are 5 to 6+ feet tall. If the Moon is also at full or waning (dark of the Moon), all the better. Canadian Thistle, or any perennial thistles, exhibit a much more extensive root system than their biennial cousins. We have an infestation due to being unable to spray in April. Apply herbicides to kill thistle, especially in spring and fall, before thistles can flower and seed. Little can be done to effectively manage these plants if they are allowed to flower and produce seed before control occurs. You should also cut it again when you see new growth to prevent it from spreading seeds. Repeated cutting of the crown of biennial thistles 1 or 2 inches below the soil surface will eventually reduce the stand by preventing seed production. 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