When you cut your grass with dull blades, you are actually tearing the grass instead of cutting it, which makes the top part of the grass blade turn brown. This could make your lawn look dull and patchy. The rule of thumb is to sharpen your blades after 10 hours of continuous cutting.
Cutting your grass too short makes it very vulnerable to disease and insects. You want to cut the top 1/3 of the grass. Example: If your grass is 3″ tall, you want to cut it at 2″. During the Spring, you may have to cut every 4 -5 days and only 8-10 days in the late summer.
Mulching or discharging puts the grass clippings right back onto the soil where they will break down and feed the lawn acting as fertilizer.
Water your lawn in the early to mid-morning. Watering your lawn in the evening creates a good environment for fungus.
Most grass only needs one inch of water per week. Over-watering opens the lawn to disease and fungus which will make the lawn look water starved and cause the lawn to have brown patches.