Answer: Regular feeding, watering and mowing should help your lawn green up. If there is a thatch buildup (more than a half an inch), or if the soil is compacted, your lawn may fail to green up even with fertilizer. If this is the case, you can rent a power dethatcher or an aerator to improve the underlying condition. A dethatcher will rake out all the old thatch and after you remove it from the lawn you can overseed. A core aerator will remove one inch by three inch plugs from the lawn. Leave the plugs on the lawn and they will dissolve in rain or water from the sprinklers. After aerating spread a thin layer of sand or compost over the area and water it in well. The sand or compost plus the soil from the plugs will work their way down into the holes left by the plugs. You can then overseed your entire lawn.
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