I have been battling this stuff for about three years. I have used every chemical on the market with varied success. I always seem to get it "somewhat" under control, and then it pops back up later in the season. What are your experiences with this stuff??? It also seems to onlygrow in certain areas of my yard. Some are in full sunlight and get plenty of water and some are in shade with very little water. I have noticed that it grows and spreads off ofa subterranean "vine/root". How do you kill this yard demon???????????