What is a key factor in preventing weed infestations in turf?

Proper mowing practices are essential in preventing weed infestations in turf for several reasons. Firstly, maintaining the optimal height for grass species through regular mowing encourages dense growth, which can shade the soil and limit sunlight reaching weed seeds, thereby reducing their ability to germinate and establish themselves. Additionally, mowing at the right height encourages the grass to develop a robust root system, making it more competitive against weeds for nutrients and water.

Furthermore, mowing can also help manage the seed heads of existing weeds if done regularly. When weeds are allowed to flower and set seed, it increases the chances of future infestations. By regularly mowing to a recommended height, you can significantly lower the likelihood of weeds taking hold in the turf.

While the other choices do contribute to overall turf health, they do not play as direct a role in weed prevention. Frequent fertilization can enhance growth but can also encourage weeds if not balanced properly. Watering at night can promote disease in turf and does not specifically target weed control. Overseeding with different grasses can improve turf density but primarily as a means of competition rather than as a direct preventative measure against weeds. Thus, proper mowing practices stand out as a crucial preventative strategy against weed infestations.