Fine grass clippings make excellent fertilizer, providing up to 40 percent of your lawn's needs.
Grass clippings are an abundant, free source of nutrients. By leaving clippings on the lawn after mowing, you're adding nutrients (especially nitrogen) to the soil and stimulating biological activity. Research has shown that leaving short clippings (one-half inch or less) can supply up to 40 percent of a lawn's annual fertilizer needs. If you find that your clippings are thick, wet and smothering the lawn, it's best to rake them up and compost them. But, if you use a lawn mower that turns the clippings into fine bits, much of your fertilization is done when you mow. Just be sure to mow regularly (so you only remove one-third of the blade's length) and keep your mower blades sharp.
Supplement the clippings with a slow-release, granular fertilizer. When to apply? It depends upon the type of grass you have: cool-climate or hot-climate.
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