Don't mow too low

Follow the one-third rule: Never remove more than a third of the total grass-blade height with any one mowing. When the grass is growing fast, you might need to cut it two or three times a week. With most varieties of grass, the higher you can stand to cut, the healthier the lawn will look. Grass that is mowed frequently always has sufficient foliage remaining to keep it looking freshly green and aids in the growth of deeper, more abundant roots. Also, be sure to mow with a sharp blade.