Beautiful yards are created by providing the best growing conditions based on a solid foundation of inputs such as fertilizers, water, seed and control products, when necessary. Core aeration - which can be performed in the spring or fall - improves your lawn's health and beauty, optimizes root development and reduces thatch and associated problems. It also deepens your lawn’s root system for greater resistance to disease, insects, drought and heat stress, improves drainage and improves air, fertilizer, water movement. It can also help reduce water usage. Overseeding is often performed in conjunction with core aeration. Refer to the Aeration Fact Sheet for more information.