Carton applicators can also be used. These have a spout-like attachment from which the granules can be poured on the lawn. Granular weedkillers need moisture to work effectively and should be applied onto grass that is damp, but not soaking wet. Grass clippings obtained shortly after applying weedkillers should be composted for at least six months. Mow the lawn at least four times before using clippings for mulches around any plants.
Many granular weedkillers are also available that kill weeds while feeding the lawn.
This encourages the grass to grow rapidly to fill in any of the gaps left by the dead weeds. Some formulas may also contain moss killers. Safe use of chemicals in the garden Always follow the manufacturer's guidelines and instructions on the packet. Keep pets and children well out of the way until the area is dry, then make sure you store the chemicals out of children's reach. In most cases the lawn can be used straight after application, but check the packet for full details.