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Reseeding your lawn can help eliminate thin or patchy portions of grass. If you’re paying a professional to aerate your lawn, it’ll cost you an additional $50 to $80 on average to reseed it  in the same trip. Reseeding a lawn yourself can cost between $500 to $1,000, meaning you’ll probably save time and money hiring a professional service. 

Yes, after the lawn is overseeded post-aeration, most of the seed germinates in the aeration holes. This leaves the soil undisturbed while lush and healthy grass will grow in the holes' place. The point of this is to create extra turf density in areas that really need it, such as a large patch of dead grass where a shed used to be.

While your lawn will reap the benefits of core aeration faster than liquid aeration, the liquid solution will last longer and have more cumulative effects. If your lawn is in really bad shape, try both. By creating holes in the soil with the core aerator, you’ll make it easier for your lawn to absorb the liquid aerator solution. You might have to apply the liquid aerator several times during the growing season, but again, the positive results will be more cumulative than with core aeration on its own.

Although core aeration is overall a better method of aerating a lawn, spike aeration can still be helpful, especially if you have a smaller yard or are only trying to work on a specific problem area. Because spike aeration is so accessible thanks to its lower cost and easy DIY tools like aerator shoes, it can still be worthwhile for some gardeners.