I only recently applied this herbicide. We have yellow nutsedge problem, which is now occupying about 40% of the lawn area. It's too early to provide a conclusive review because not much time has passed since the initial application. Plus, it's been unusually rainy and very hot both before and after applying Empero Nutsedge Killer, factors that likely reduce herbicide efficacy. I'll follow-up this review when more time has passed. Because of heavy rains and high temperatures, the herbicide may have to be reapplied, which of course is no fault of the herbicide manufacturer.