Answer: Thistles will spread by seeds so as long as the fields adjacent to your home have thistles, you will have them, too. Perhaps the best approach is to contact the school or your county weed management department for assistance. If they torch or flame the thistles before the plants flower and set seeds, and you do the same in your yard, you'll be able to get the upper hand on these weeds. Wish there were an easier way to eradicate them!
Q&A Library Searching Tips