Answer. First I will do all I can to remove living plants above the ground. The key to Canada thistle's weediness is its root system. A couple of days ago, I connected with a large field of wild Canadian thistle. A small slice is all that is necessary, so do not cut the stem in half. There’s just no easy way to say this, my gardening friends: An invasion of thistle in your vegetable garden is bad news. 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. ... Cut the stem of each thistle plant with a knife. 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. 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. by Katrina Blair. 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. How do I get rid of Canadian thistle as organically as possible? As the root system spreads, it gives rise to new shoots. 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. If left unchecked, a single Canada thistle plant eventually turns into a patch containing thousands of stems. 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]. Organic producers may be able to reduce the need for tillage to control Canada thistle with system design. 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. Effective nonchemical methods are valid options for noxious weed control in North Dakota. Thistle – specifically Canada Thistle – appears over a wide area of the U.S. and obviously, Canada (Bull Thistle and Creeping Thistle are closely related). 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. Thistle is one determined gardening foe. How To Get Rid of Canada Thistle. We recommend 2 4-D Amine Herbicide to treat Canada thistle. Both Canadian thistle and bull thistle are common. The roots of Canada thistle spread aggressively, and can increase the width of a thistle patch 6 to 10 feet in a season. 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