How do I get rid of Canadian thistle as organically as possible? Spray one to two sprays of vinegar directly on the cut of each thistle plant. This cool season perennial (Zones 2-8), known for its difficulty to kill and its desire to take over your garden completely and totally, is a scourge for gardeners. Canadian is rhizomatous, while bull is more biennial or short lived perennial--really different control strategy. ... Cut the stem of each thistle plant with a knife. In general I've been told that the beginning of flowering is the time of year when the maximum energy is in top growth compared to root storage. The roots of Canada thistle spread aggressively, and can increase the width of a thistle patch 6 to 10 feet in a season. Our team, Bee Happy Lands, a project of Turtle Lake Refuge, had been hired to organically manage the 600 acres of land of a private lake sporting club outside of Durango. If left unchecked, a single Canada thistle plant eventually turns into a patch containing thousands of stems. Introduction Producers in organic farming would like to reduce the amount of tillage used in their cropping systems to limit the detrimental impact of tillage on soil health (Sooby et al. Thistle – specifically Canada Thistle – appears over a wide area of the U.S. and obviously, Canada (Bull Thistle and Creeping Thistle are closely related). Organic producers may be able to reduce the need for tillage to control Canada thistle with system design. The key to Canada thistle's weediness is its root system. As the root system spreads, it gives rise to new shoots. I will take a risk at catching some flack from some of the organic purists, but I prefer very judicious use of a chemical pesticide for the worst of the noxious weeds. A couple of days ago, I connected with a large field of wild Canadian thistle. Canada Thistle is an invasive creeping perennial that creates large patches where established and is a common threat to homes and agricultural lands in the upper mid-west. Both Canadian thistle and bull thistle are common. To recap the three pronged organic management approach that I’ve come up with to combat Canadian Thistle: 1) Selective removal of plants 2) Graze/mow high 3) Open up the compacted soil. It is selective and will kill the plant all the way down to the root. Organic farmers face a serious challenge when controlling Canada thistle and other noxious weeds, but insisting that noxious weeds must be controlled by synthetic herbicides is incorrect. We recommend 2 4-D Amine Herbicide to treat Canada thistle. A small slice is all that is necessary, so do not cut the stem in half. Connecting with Canadian Thistle. 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]. Answer. Learn how to get rid of thistle and the best way to control thistles in your garden without resorting to scorching the earth with chemicals. First I will do all I can to remove living plants above the ground. Effective nonchemical methods are valid options for noxious weed control in North Dakota. by Katrina Blair. How To Get Rid of Canada Thistle. 2007). Thistle is one determined gardening foe. There’s just no easy way to say this, my gardening friends: An invasion of thistle in your vegetable garden is bad news. Sprays of vinegar directly on the cut of each thistle plant eventually into! 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