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To prepare your lawn for core aeration, water it the day before you aerate. (Alternatively, you can wait until it rains and aerate the following day.) Aerating after watering or a rainy day will make the process easier since you can penetrate moist soil better than dry soil. You should also flag your sprinklers so that you don’t accidentally hit them while aerating. If you have a lot of thatch buildup in your yard, you might need to dethatch your lawn before aerating as well.

Yes, you can DIY either core or liquid aeration for your lawn. You can use a manual core aerator or rent an automatic one. Just be sure to mark off yard obstacles like sprinkler heads before you start. Liquid aeration is easier—just hook up a garden pump sprayer, although some are able to be attached to a hose. While liquid aeration is not as laborious as core aeration, you will need to focus on an even distribution of the solution across your entire lawn for it to be effective. Of course, if you are unsure about doing both, call a pro.

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.

It depends on the current health of your lawn. Liquid aeration takes longer to work, but the results are longer lasting. Since you can apply the liquid solution several times during the course of the growing season, the results are cumulative. Core aeration, on the other hand, will offer quicker benefits but they will diminish sooner, right along with the soil plugs left behind.