Mowing height and frequency depends upon many factors. The species of grass, the variety developed, the usage, climate, watering system or not, fertilization, weeds and sometimes disease.
The time of the year will also affect the rate of mowing. Whether it is a new lawn or older established lawn, grasses that are in a-one shape and getting the right amount of fertilizer and water will naturally grow faster and need more mowing
Mowing early in the spring as the grasses get started helps to remove the weeds, which are already getting to the seeding stage. This helps cut down on the usage of herbicides. In the cool season areas grasses that are affected by fungi sometimes require more frequent mowing to remove the growth and get more air circulating to help prevent or lessen fungal attack.
Mowing of heat stressed grass in the middle of the day only promotes more loss of moisture and nutrients unless watering systems are used shortly afterward. Warm season grasses con withstand the shorter mowing if done on a regular schedule and actually respond by better root development and thicker foliage.