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Throwing grass seed on existing lawn isn’t likely to germinate, grow roots, or become healthy grass. You need to prep the soil, spread fertilizer with your seed, and sow the seed into the soil. Water the seed every day for two weeks to ensure it germinates and grows roots. Be sure to stay off the area and wait to mow until it reaches optimal height.

Your lawn needs to recover after aeration, so make sure the work is done at some point during its peak growing season. This will depend on your region and the type of grass you have, but generally, aerate once or twice per year, either during the late spring, early summer, or early fall.

It’s best to fix lawn depressions during late spring. You want to wait until after your last frost date and when the yard is not too wet. This also allows ample time for new grass growth once you reseed.

Don't pick up or dispose of aeration plugs. They will break down by themselves in one or two weeks. Rainfall will speed this up, as will watering the lawn. Mowing helps, but don't mow the grass too soon post-aeration. It's unusual that the plugs would remain after three or four weeks, but mowing and raking will break them down by that point.