
Last month I wrote about Scotch Thistles, a noxious weed in Colorado and in many other states. Then there are Bull Thistles, Musk Thistles, Plumeless Thistles, and Canada Thistles, also on the Colorado noxious weed list. This begs the question, are all thistles invasive, nasty plants, or are there some good guys among them?
