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A lawn that suddenly and quickly turns yellow is typically the result of a dramatic change in the grass's environment. Heavy rainfall can dilute soil nutrients, rapidly yellowing the grass, and dull lawn mower blades can dry out and damage the grass in a short time. Over-fertilizing can yellow a lawn within a matter of days. 

Whether you’re putting down fresh seed or reseeding, there are a few things to keep in mind when seeding your lawn. Be sure to choose the correct seed for your climate, seed at the right time of year, and water two to three times a day for the first week. Generally, Dudley recommends seeding in spring and fall as it is usually cooler and rainier.

Overseeding after aeration is not always necessary, but it can be highly beneficial, especially for lawns with thin or patchy areas. Aeration creates an optimal environment for new grass seed germination by improving soil contact and reducing competition from thatch. If you aim to thicken your lawn, address bare spots, or introduce a new grass variety, overseeding immediately after aeration can help rejuvenate and enhance your lawn's overall health and appearance. However, whether you overseed or not depends on your specific lawn goals and condition.

Both aerating and scarifying your lawn can offer serious benefits. Aerating pokes holes in the soil to better allow air, moisture, and nutrients to permeate while scarifying removes the buildup of dead plant matter at the soil’s surface. Most lawns require both of these maintenance items to thrive.