How To Kill Canadian Thistle

Question

Have a large area that has Canadian Thistle in it. I have used several diffent weed killers but they just keep spreading.

Answer 1

It will take diligence with whichever method you choose, but boiling water is quite effective. It helps, greatly, to catch these plants before they flower, as well. Unfortunately, they can spread with small amounts of root. This means that diligence will be the best way forward. Here is an article for more information:

https://www.gardeningknowhow.com/plant-problems/weeds/canada-thistle-control.htm