<p>If your lawn is in poor shape because of damaged or thin areas, over seeding is a good idea. Grass seed with an added fertilizer is a good lawn treatment. Mowing, feeding and watering are the three most important things you'll be doing over the growing season. Cutting a third of the grass height is about right. Look for lawn treatment products designed for your type of soil and follow the instructions on the package. Lawns usually require a feed rich in nitrogen in the spring and fall. Water your lawn early in the day - the amount will depend on the type of soil but be sure not to over-water the grass.<p>