Which cultural control practice involves maintaining the height of turfgrass at three inches?

Maintaining the height of turfgrass at three inches is primarily associated with frequent mowing. This practice is integral to healthy turf management because mowing at the right height promotes root development, encourages dense turf growth, and reduces the establishment of weeds. When turfgrass is kept at an optimal height, it allows for better light penetration and air circulation, which contributes to a more resilient and healthy lawn. Frequent mowing at three inches also prevents the grass from going to seed or becoming too leggy, which can lead to a weakened turf structure and higher vulnerability to pests and diseases.

The other options—heavy fertilization, watering less frequently, and applying pesticides regularly—do not relate to maintaining a specific height of turfgrass. While fertilization and watering can certainly impact turf health, they do not directly involve the practice of mowing height management.