Soil color can be deceiving... and does not indicate the fertility. The darkest soil may be poorest in nutrients. While grasses will survive without fertilization, they will not do so and look and perform to the standards we set for them today. A healthy, green, lush lawn is generally a result of a correct fertilization program.

You will find a lot of different opinions among the experts, about how often and when to fertilize. In general you should fertilize at the beginning of the season when the type of grass you have (cool or warm season) most actively grows. For cool season grasses this is in fall and spring. For warm season grasses the time is late spring as growth really accelerates.