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. First I will do all I can to remove living plants above the ground. Canadian is rhizomatous, while bull is more biennial or short lived perennial--really different control strategy. We recommend 2 4-D Amine Herbicide to treat Canada thistle. 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. by Katrina Blair. 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. 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. As the root system spreads, it gives rise to new shoots. Connecting with Canadian Thistle. If left unchecked, a single Canada thistle plant eventually turns into a patch containing thousands of stems. How do I get rid of Canadian thistle as organically as possible? 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. 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. 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. Thistle is one determined gardening foe. Organic producers may be able to reduce the need for tillage to control Canada thistle with system design. There’s just no easy way to say this, my gardening friends: An invasion of thistle in your vegetable garden is bad news. ... Cut the stem of each thistle plant with a knife. 2007). Answer. Spray one to two sprays of vinegar directly on the cut of each thistle plant. The roots of Canada thistle spread aggressively, and can increase the width of a thistle patch 6 to 10 feet in a season. A small slice is all that is necessary, so do not cut the stem in half. 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]. A couple of days ago, I connected with a large field of wild Canadian thistle. 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