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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.

First, you should figure out whether you have dormant or dead grass. Dead grass won’t come back, so you’ll have to reseed if you’re hoping for a lush lawn. However, grass can go dormant if it hasn’t received enough water or if temperatures are too cold. If it’s still decently warm outside, you can revive dormant grass by watering it. But if it’s mid-January in New England, for example, you’ll need to wait until the weather warms up again. If you want to keep grass green in winter, consider a grass like Kentucky bluegrass, which maintains its color year-round.

When you don’t aerate your lawn, the soil will become more compact over time. This limits how much water can soak in to reach the roots of your grass, and it keeps oxygen and carbon dioxide from the plant roots. This can limit grass growth, which may sound great for limiting mowing, but it also leads to a lawn full of grass that looks dull and sparse. Eventually, compacted soil can weaken grass, while also making it more vulnerable to pests, diseases, and erosion and even causing it to die off.

If you accidentally watered your grass too much during the winter months, try aerating your lawn to encourage absorption of the water into the soil and improve drainage. Dethatching your lawn can also help the solid recover from overwatering and encourage healthy root and stalk health in your grass.