Posted 9/9/2013 17:36 (#3318036 - in reply to #3317285) Subject: RE: How do you get rid of Canadian thistle without using herbicide
Mather, Manitoba
Cut the patches it and bale up the thistles(get it off the field) just before a big rain. Water down the stem kills them for some reason.
What also works is to mow them every 10-14 days starting about mid June. They will go into survival mode and pull nutrients from the roots and put it into top growth in order to survive. By the time fall hits they won't have enough energy stored in the root system to survive the winter.