When aerating your lawn, cores of soil – hence the name coring – will be taken out of the soil to loosen it and allow water, air and nutrients to better penetrate the soil. It is recommended to leave these removals on the surface of the lawn. They will naturally decompose and feed your lawn. If you want to speed up the process, you can break up the clumps with a rake. To learn more about aeration, read our article on the subject.