Why Use a Core Aerator

A core aerator does a better job of aerating your lawn than other types. This is especially important if your lawn is suffering from the problems associated with packed down and dense soil. You do not want to use an aerator that will not penetrate deeply enough into the ground to provide what the grass needs to stay lush and green.  An ineffective aerating job is a waste of time and money.
When the soil of the lawn is greatly compacted, there is no room for the grass roots to grow down into the ground. Instead they grow toward the sides, creating an interconnected layer of grass roots near the surface.  These roots are all competing for the same nutrients, water and oxygen found in the few inches of topsoil where the roots are.  It is hard for there to be enough to maintain them all. The roots are weak and shallow, making the grass more likely to dry out when it is hotter and drier, and making it easier for weeds to come in and out-compete the grass.
Core aeration fixes these issues by creating holes in the ground, making the soil fluffier and less packed down. When the hollow cores of the aerator are pushed in to the dirt and then pulled out, they remove soil plugs, around two or three inches long. The remaining holes expose the roots, making it easier for them to soak up water, fertilizers and other nutrients. The roots are also able to grow into the spaces left and then down deeper into the ground, since the soil has been loosened.
Core aerating should be part of your regular lawn care routine, about every three years for lawns in good shape. If the soil is mostly clay, sees heavy use or gets quickly compacted for another reason, it is a good idea to do it more frequently, probably every year. Lawns that are currently heavily compacted should be done more frequently until they are less compressed.

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