What is the recommended mowing height for most cool-season grasses?

The recommended mowing height for most cool-season grasses is between 2.5 to 4 inches. This range is optimal for several reasons. First, maintaining grass at this height encourages deeper root growth, which enhances drought resistance and overall health. Tall grass has more leaf surface, which helps in photosynthesis and allows the plant to store more energy. Additionally, mowing at this height helps to prevent weeds from establishing since taller grass can shade out many weed species.

Mowing above this recommended range can increase the risk of disease, as taller grass may retain more moisture, creating a favorable environment for pathogens. Conversely, cutting too low can stress the grass, making it more vulnerable to pests and environmental stressors. This balance provided by the recommended height supports a robust and resilient lawn, which is particularly vital in a landscape maintenance context.