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You can thicken new grass by using fertilizer, watering it 1 to 1½ inches per week, mowing when it is at an optimal height, and preventing weeds. You should fertilize your grass while you plant the grass seed, or soon afterward. Use an herbicide to prevent weeds or spot spray with herbicide to kill existing weeds.

Depending on your lawn mower type, you can mow anywhere from 2.5 to 13 miles per hour (mph). A simple push lawn mower will take the longest to mow at 2.5 mph, which is just under the average walking pace. Riding mowers can go significantly faster. Rear engines come in at around 5 mph, tractors come in at just shy of 8 mph, and zero-turn mowers come in at the fastest speed of 13 mph.

Signs of an overwatered lawn can be visual, physical, or related to pests and weeds. Visually, the grass may appear yellow, wilted, patchy, or thin instead of green and lush. You might also notice the presence of mushrooms, other fungal growths, or an increase in weeds like crabgrass. Physically, the soil may be waterlogged, soggy, and perpetually damp. An overwatered lawn often feels mushy or makes a squishing sound underfoot, even several hours after watering. Additionally, you may see an increase in pests such as grubs. To prevent overwatering, ensure your lawn has proper drainage through periodic aeration and adjust your watering schedule to meet its actual needs.

While it's a good idea to water your grass during a drought or when temperatures are high, you should not water your lawn every day. For most lawns, watering one to three times per week is sufficient. Avoid watering in the middle of the day or when the temperature is above 95 degrees Fahrenheit, as the extreme heat will cause the water to evaporate before the soil can fully absorb it. The best time to water your lawn in the summer is in the early morning at dawn or in the early evening, such as between 4 p.m. and 6 p.m., when it's cooler.