What is a typical mowing height range for cool-season turf grasses?

• A. 0.5 to 1 inch
• B. About 2 to 3.5 inches
• C. 4 to 6 inches
• D. 5 to 8 inches

Answer: (B)

Maintaining an appropriate mowing height for cool-season grasses is about balancing leaf area with plant stress tolerance. Cool-season grasses such as Kentucky bluegrass, perennial ryegrass, and tall or fine fescues stay healthiest when mowed at a moderate height, typically around 2 to 3.5 inches. This height provides enough leaf surface for efficient photosynthesis, supports dense turf that suppresses weeds, and helps the grass recover quickly after mowing. Cutting too short (for example around half an inch to an inch) risks scalping and damaging the crowns, especially in warm weather or when the lawn is stressed. Mowing too tall (several inches) can lead to a shaggy appearance, encourage thicker thatch, and create conditions for disease and weed intrusion. A good practice is to remove no more than one-third of the leaf blade at a time, which helps prevent stress while maintaining the desired height.