We're sorry to read about your disappointment with Ortho GroundClear Weed & Grass Killer and appreciate your feedback.This product is not systemic but kills off the top of weeds thoroughly treated at time of application. For annual weeds, especially if young, this will typically kill them. If the weed is mature, no matter what weed, it will be more difficult to control. Some harder to control or mature weeds will need multiple applications. To get the best results plant leaves must be thoroughly and uniformly covered with the spray solution. If the application does not cover the entire plant, the control will be less and a reapplication will be needed. Product works best when temperatures are between 65 - 85 degrees F. We want you to be confident in our products. For this reason, we offer a product guarantee to our consumers. At your earliest convenience, please reach out to us at 866-324-9192 if we can further assist.