Small rosettes can be removed by hand by cutting the plant below the soil surface to prevent regrowth. I have spent years pulling them, root and all, and lately they were cut down, along with the very tall grasses. Cutting. We have a lot of it and Scotch Thistle in our 2 acre field. Apply herbicides to kill thistle, especially in spring and fall, before thistles can flower and seed. 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.' 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. The flowers should be cut before drying out. Preventing seed production is of utmost importance when attempting to manage thistle populations. 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. 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. Little can be done to effectively manage these plants if they are allowed to flower and produce seed before control occurs. More more effective control, cut plants with a sharp shovel at … Cut thistles in July, they’ll lay down and die. Just to let you know, Katrina, cirsium arvense is actually called Canada Thistle, just like the geese, Canada Geese. Thistles in your garden can be sliced off with a hoe; cut them as close to the ground as possible. Tall thistles should not be sprayed with weed killer. Spear Thistles they depend on wind dispersal of the seeds with the seeds usually falling to earth in the first 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. Mowing is generally less successful on deep-rooted perennial weeds and brush. 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. 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. 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. 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. Canadian Thistle, or any perennial thistles, exhibit a much more extensive root system than their biennial cousins. 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. Too many nearby desirable plants will be killed. One great way to kill thistles … You should also cut it again when you see new growth to prevent it from spreading seeds. Thistle Root. Don't let thistle get to the stage in which the stems elongate and begin to produce flowers. 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