Many people do not like the look of a recently aerated lawn. Because core aeration uses a machine that pulls up small plugs of soil scattering them throughout the yard, many people find this look unappealing. The truth of the matter is that the benefits outweigh this unsightly look which only lasts for a few days. It takes approximately 1 to 2 weeks, but the plugs will break down and decompose. If you simply can’t wait for that to happen, you can rake them and put them in a tiny pile.