The Lawn Coring and Aeration Process The process of lawn coring involves a lawn coring machine being moved over a lawn removing plugs of turf and soil as it progresses. The lawn coring machine is equipped with hollow tubes called tines, which are punched through the lawn and into the soil by the machine as it advances over the lawn. Each tine removes a plug of soil and turf from the lawn, leaving the plugs on the surface as the machine progresses. At the completion of the coring a rotary mower is normally used to clean up the plugs left on the lawn. A quality fertilizer and wetting agents are then usually applied, to be watered in by the home owner.