Aeration You rip your drive down the first fairway, you have a wedge in which you proceed to knock 15 feet from the pin; birdie is almost certain, that is until you get to the green and find out they have just been aerated. While many individual rounds have been ruined by having to play on aerated greens, the process is necessary to keep greens in optimal conditions throughout the year. Green Aeration is an extremely important maintenance practice that needs to be performed. Although it results in usually temporary disruption of the green, aeration improves the ability for water and fertilizers to get into the soil of the green by reducing soil compaction, stimulates grass root growth for healthier grass, helps control thatch build-up(a layer of organic material below the surface of the green that has died), and improves overall growing conditions. Aeration is usually performed once or twice per year, and in the New England area, is usually performed one in the spring and once in late summer or fall.