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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.

No, it's not a good idea to put grass seed directly on top of dead grass. For successful germination and growth, grass seed needs good soil contact. To prepare the area, start by removing the dead grass using a shovel or a sod cutter. Then, loosen the soil, add soil amendments if necessary, and spread the grass seed evenly. This allows the seed to come into direct contact with the soil, promoting better germination and establishing a healthier lawn.

Several signs indicate that your lawn may require aeration. If you notice water pooling or runoff after rainfall, it suggests poor water infiltration, and aeration could help. Compacted soil may cause grass to thin out, turn yellow, or struggle to grow. Additionally, the presence of a thatch layer, which is a buildup of dead grass and debris, can indicate aeration is needed to alleviate thatch and promote healthier grass growth. Monitoring these signs can help you determine when your lawn would benefit from aeration.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.