How to apply. For best results with Weed and Feed, lawn should be moist prior to application. After application, water well. Do not use on Bermuda Grass or any type of Northern grasses. Do not put Weed and Feed in the flowerbeds. Bug Blaster and F-Stop are safe for your flower beds and lawn. Do not mix all three packages. Apply Weed and Feed first, Bug Blaster second, F-Stop third.