We apply 5 times a season. First we apply a granular pre-emergent crab grass killer with a balanced "slow release" fertilizer. No spray and grow madly chaos for your lawn! Second, later in the Spring, we apply a spray weed killer. (Spray has proven to be the most effective on weeds.)
During the Summer we apply a light granular application of "golf course grade" slow release fertilizer.
In early Fall we again apply another application of spray weed killer. This is then followed up later with another application of granular "golf course grade" slow release fertilizer which gives your lawn just what it neds to winter over til Spring.