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Yes, you can overwater your grass. Depending on your climate, it could be easier than you think. While water is an essential element for lawn growth, too much of it can actually damage its roots, leading to rot and other damage.

Whether your drip irrigation system leaks, it’s been a rainy summer, or you use the sprinkler too often, overwatering your lawn can drive up your water bill and impact the longevity of your lawn.

Power seeding machines do a great job of creating narrow trenches in the soil to plant grass seeds into, but aerating before power seeding can be beneficial for your lawn. By aerating first, more water, oxygen, and carbon dioxide can reach the roots of your germinating grass seeds. Plan to aerate your lawn about once or twice a year, whether you plan to power seed or not.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Experts typically recommend aerating your lawn about once per year, but your aeration frequency will depend on your soil type, lawn condition, and other factors. For instance, you should aerate annually if you have clay-heavy soil or frequent foot traffic in your backyard. However, if your soil is loose or sandy and you don't use your yard often, you can probably aerate every other year.