Raising the height of your mower is one of the simplest and most important things you can do for your lawn's health. Adjust your mower so that it cuts your grass at 2.5 to 3 inches (6 to 8 cm) high. Longer grass blades result in deeper root growth. Longer grass also creates shade that prevents weed seeds from germinating.
Mowing frequency is also important. The more often you mow, the thicker your lawn will become. Once per week is sufficient when your grass is actively growing.
Instead of bagging your grass clippings, leave them on the lawn. Unless they are exceptionally long, grass clippings won't cause any problems. In fact, they can provide about one-third of your lawn's nutrient needs and are a valuable source of organic matter.
COPYRIGHT 2009 F&S LAWN SERVICES