Why Aerating Helps Lawns
Grass roots need air, water and nutrients to grow thick, deep and strong. When soil becomes compacted, even slightly, it inhibit the flow of the essentials that support thicker, healthier turf growth. A layer of compacted soil just 1/4 to 1/2 inches thick can make a significant difference in the health and beauty of your lawn.1 Aeration creates holes down into the soil to alleviate compaction so air, water and nutrients can reach grass roots.
Deprived of their basic needs by compacted soil, lawn grasses struggle in stressful situations, such as heat and low rainfall, and lose their healthy, rich color. Grasses gradually thin and eventually die out completely, for lack of the oxygen, water and nutrients available just inches away. Even a single aeration session can open the avenue for these essentials to reach their mark and put your lawn back on an upward trend.
check out https://www.pennington.com/all-products/grass-seed/resources/why-aerate-your-lawn for more information on when to aerate your lawn.