5. Brown grass
This is usually a sign of overmowing, which prevents the grass from getting enough water. Set your mower a little higher and mow less frequently. The higher you allow your grass to grow, the better it retains moisture, especially during hot, dry spells. Sometimes brown grass is a sign of nutrient depletion, in which case you may want to plant some clover to help affix nitrogen in the soil. A soil test will tell you if your soil needs added nutrients. Brown grass may also be caused by white grubs, a pest that can be eliminated with the same beneficial nematodes used to fix bare patches.