The grass plant needs to get high enough to allow photosynthesis and cutting to low can actually stress and kill the root system of the plant. There are great benefits of cutting the grass at the recommended height. First, the root systems are generally proportional to the height of the grass above the ground, therefore the higher the grass is typically cut, the deeper your roots grow which help for drought resistance and the available nutrients found in the soil. Another benefit is that weeds need sunlight to grow and higher grass blades will shade the ground, helping to prevent weeds from germinating, this is another natural cultural practice in maintaining a beautiful lawn.
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