All service visits are carried out by government-licensed applicators. After each spray, most common broadleaf weeds such as dandelion, thistle, and clover will die within one week, however, some pesky weeds may need a second application for it to take full effect. With our unlimited weed control, if you find that you still have weeds on your lawn after our application, we will re-visit and apply again free of charge. You can rest assured we will make sure you have a weed-free lawn the entire summer!