I'm surprised that thistles come up in your lawn, Anna. When we moved in, our entire front field was inundated with thistles. After several years of brush-hogging the field (and pasturing cows and horses), we finally got a handle on them. We still get them on the edges, but not nearly as bad. I don't think I've ever seen one in the lawn itself. You may have a different variety than me, mine are Canada thistle. Prickly buggers.
