[header] How to fertilize a lawn [title] Know your grass. [step] The type of grass you have will determine what type of fertilizer you need to use, and how often you need to fertilize. Some regions have primarily warm season grasses, while others have primarily cool season grasses. 
If you don't know what type of grass is growing in your yard, ask your neighbors who have similar grass, or take a sample to your local garden center. [substeps] Warm season grasses grow primarily in the southern regions of the us.