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Each type of grass has its own specific needs regarding the timing of aeration, but in general, late summer to early fall is the best time to do so. For most lawns, that means sometime between September and November, though certain types of grass, like St. Augustine Grass, do better with aerations in late spring and early summer.

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.

Yes, you should water the lawn after aerating. Now that you’ve loosened up the soil to better receive nutrients, it’s time to hydrate and fertilize your lawn. You’ll want to keep it evenly moist to promote healthy growth. Don’t drown your grass—too much of a good thing can reverse all the work you’ve done with aeration in the first place. But especially if you’ve overseeded and/or fertilized after aeration, you’ll want to ensure a moist soil layer to absorb those nutrients and fuel for new growth.

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.