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Generally once yearly or twice if the lawn experiences high traffic or is part of heavy clay soils.

You should put pre-emergent herbicide and fertilizer on your lawn in the spring. Pre-emergent herbicide keeps weeds from taking root. Fertilizer helps your grass to grow lush and dense and blocks future weeds from growing. You can also add amendments, such as sulfur and lime, to enhance your soil quality. 

You can thicken new grass by using fertilizer, watering it 1 to 1½ inches per week, mowing when it is at an optimal height, and preventing weeds. You should fertilize your grass while you plant the grass seed, or soon afterward. Use an herbicide to prevent weeds or spot spray with herbicide to kill existing weeds.

Before starting any digging project, you must call 811, the national “call before you dig” hotline. After calling, a representative will come out to your property to mark the places where any utility wires or pipes run below the ground so that you can edge or dig trenches safely. You are liable for any damage to utilities and other systems beneath the ground on your property, and you could be seriously injured if you accidentally run into wires or utility lines.