When should I fertilize my grass?
Two or three fertilizer applications are recommended a year to produce a healthy and vigorous lawn. In the spring (late May/early June) apply a slow release, granular fertilizer high in Nitrogen (N) (i.e. 8-2-3) to provide food gradually over the entire lawn and by spreading evenly it prevents burning. Nitrogen aids in the formation and function of chlorophyll which provides food for the grass plant. The second and third numbers, Phosphorus (P) and Potassium (K), aid the grass in root growth and overall health and stress resistance.
A second feeding in the Summer is optional. Use a slow release, granular fertilizer again which will continue to keep your lawn green, thick and healthy.
Fall fertilizing is the most important. You want to ensure your lawn makes it through the winter and will remain strong and healthy. Fall fertilizing encourages the roots to grow and food is stored for the next season. A fall fertilizer should have a lower Nitrogen (N) count than Phosphorous (P) and Potassium (K) to encourage root growth and consequently the health of the plant.