Combination seed and fertilizer products contain a growing material that retains water and protects the grass seed. The nutrients feed the seed to help it develop a strong root system.
There is no need to add an additional fertilizer because the combination products contain a continuous-release formula. The blends typically contain nitrogen, phosphorus and potassium to promote vigorous growth.
Grass seed and fertilizer products use varying types of grass seed, such as Bermudagrass. A mixture of more than one kind will ensure that you benefit from the best qualities of each seed type. Make sure the blend is a type of seed that grows well in your region.