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Adding seed to existing grass is often known as overseeding, as opposed to reseeding. Reseeding refers to the process of filling in bare or dying patches of lawn—or in some cases, full lawns—whereas reseeding supports existing lawns to prevent thinning. Overseeding is an ideal annual lawn care practice for grass fighting drought, disease, weeds, or pest issues.

Aeration can level your lawn if the issue is minor soil compaction, so it can help smooth things out if your yard is bumpy from foot traffic or vehicle traffic. However, it won’t slope your yard. If you have small areas where water seems to pool after precipitation, aeration could help, but larger issues with improperly sloped lawns and problems leading to foundation leaks or structural damage will require more comprehensive solutions.

Post-seeding care involves regular watering, mowing when appropriate, and occasional re-seeding to cover sparse areas.

The best way to fix a lumpy yard depends on the cause. However, in many cases, you can address yard lumps by improving the health of your soil and turfgrass. Choose grass varieties that are best suited for your area and look for disease-resistant varieties. Fertilize and water your lawn as needed to keep it looking lush throughout the warmer months. Mow your grass at a height of 2 to 3 inches once or twice a week.