Core Aeration Benefits: Mechanical core aeration will help alleviate excessive thatch, reduce water run-off and increase water penetration.  When is the best time to aerate?    Spring or fall is the best time to use aeration to enhance the development of a deep root system so that it can withstand drought, disease and insect stresses. Enjoy the benefits of professional core aeration &amp; over-seeding! To read more... http://www.greenlawnfertilizing.com/aeration-seeding/