Grass roots need air, water and nutrients to grow thick, deep and strong. Aeration creates holes down into the soil to alleviate compaction so air, water and nutrients can reach grass roots.
Aeration can take place at any time of the year, but the best time is usually in the spring/early summer or fall. The general recommendation is to core aerate when there is the most root growth. Cool-season grasses: bluegrass, ryegrass and the fescues, receive the most benefits when the lawn is aerated in the fall or early spring.
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