I have approx. 1/4 acre of prairie plantings (including septic mound) on my property in southern WI. I try to burn every other year and carefully spot treat problem weed areas with roundup. Canadian Thistle is persistent to where I've been tempted to try an herbicide called Milestone. I go to great lengths to avoid herbicides/pesticides so I wish I wasn't even thinking about this approach. I am very frustrated to be at the point of considering this. Wondering if others have safe & effective ways of dealing with significant amounts of this awful stuff? It continues to survive mowing/cutting, burning & Roundup. Thank you for any advice!