Cutting grass too short weakens it. Longer grass grows stronger and thicker and crowds out weeds. Weed seeds can't germinate easily since they don't get much light. Established weeds have a tougher time competing with the surrounding turf.
Each type of grass has an ideal mowing height to maintain its health and thickness. It's about 2-1/2 in. for most cold-climate species. Cut most warm-climate grasses a bit shorter: 1-1/2 to 2 in. If you're not sure of your grass type, take a sample to a local nursery. Or type "identify grass" into an online search engine for help. Although most lawns contain a mix of grass types, they should have similar ideal cutting heights.
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