How do I get rid of Canadian thistle in my yard?
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After researching, I found these sites, hoping you can glean info from them.
https://www.gardeningknowhow.com/plant-problems/weeds/canada-thistle-control.htm
https://www.thriftyfun.com/tf20534583.tip.html
https://www.quora.com/How-can-you-get-rid-of-Canadian-thistles-easily-fast-and-organically
Water with pure vinegar.
Canadian thistle can be killed with either Roundup or 2,4-D weed killers. These weed killers will kill back the leaves on the plant and will kill back some of the root system. The best time to apply these weed killers is on sunny days when the temperatures are between 65 and 85 degrees F. (18-29 C.).