The roots grow very wide and very deep so it will take several applications to get enough of the herbicide into the roots to kill the entire plant. If not treated regularly Canadian Thistle will recover and continue to … Found throughout most of … Since mature plants have root systems that can extend for 10 feet, you will have better luck pulling up immature plants. Canada thistle grows on an extensive root system that can go quite deep into the ground, and the plant can grow back from even a small piece of root. Chemical control with labeled herbicides will drastically help with thistle control. As the root system spreads, it gives rise to new shoots. Canadian Thistle. Removal of low growing tree branches will make directed applications easier and less likely to injure trees. Canada thistles (Cirsium arvense) thrive in almost any condition. If left unchecked, a single Canada thistle plant eventually turns into a patch containing thousands of stems. Classification: Cirsium arvense Geographic Location: Northeastern, mid-Atlantic, Great Lakes, and northern Great Plains states Description: It is a herbaceous perennial plant that grows 30–100 cm and forms extensive clonal colonies from rhizomes that send up numerous erect stems each spring. How to Get Rid of Canada Thistle When starting a Canada thistle control program, it is best to first understand what makes Canada thistle such a difficult weed to control. Thistledown is a selective herbicide (Clopyralid 40.9%) for post-emergent control of broadleaf weeds in rangeland and permanent grass pastures. Stems are green and smooth, mostly without spiny wings. To get rid of Canada thistles, it's best to catch them when they are young and small. Roundup should not be applied to green or freshly injured stems. Canada thistle is at the correct height about June first (by June 20 thistle is 36 to 48 inches tall in full bloom) and in the fall (September and early October). While most people familiar with Canada thistle will tell you that it’s a good-for-nothing, it’s worth noting that the flowers are filled with nectar beloved by pollinators. When the soil is loose, such as after a rain, it's fairly easy to pull them and get a long section of root, even barehanded. The key principle to Canadian Thistle control is to stress the plant and force it to use stored root nutrients. This is a rare win-win situation because the greatest thistle control coincided with the grazing system that gave the best production and best utilization of thistle.” For more information or to receive an electronic version of the booklet, How to Win the War on Canada Thistle, contact Bork at 403-492-3843 or [email protected]. Instead, I get better results pulling the weeds from my lawn physically. Still, there are plenty of non-invasive pollinator plants to choose from, so just go ahead and get rid of this menace. The best way to get rid of thistle is to use chemical control where possible. It is useful against thistles, such as Canadian thistle, musk thistle, star thistle and knapweed and more.It is labeled for use in noncrop areas with no grazing restrictions. Treating to get rid of thistle. The key to Canada thistle's weediness is its root system. I use this weed pulling tool to improve my chances of getting the root instead of just the leaves. Pull up as many of the existing thistle plants as you can, both mature plants and seedlings, making sure to get the whole root network. I don't have any affiliation with the company - I'm just happy to find a tool that has made getting rid … This is especially important with Canada thistle. Canadian Thistle is one tough weed that wants to stay alive and re-grow! The Best Way to Get Rid of Thistles in Your Garden. 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