Early this month, entire lawns or bare patches may be seeded with appropriate grass seed mix.
Grubs chew grass roots, and they may be present if your turf begins to brown and lifts easily off the ground. Minor damage is usually not cause for treatment. Pull back turf and check for white, C-shaped larvae with black heads. If more than 10 to 12 grubs are present in a square foot of soil, treatment is advised. Chemical controls vary in their timing. Homeowners can spot-treat small areas immediately with a recommended control or, wait until the third week of next June to apply imidacloprid. As temperatures become cooler in fall, the grubs will move further down in the soil, making them out of reach of chemicals.
Consider core-aeration of lawn, if not done this year. Professional lawn services can provide the equipment (and the service itself) to remove plugs of soil and grass at regular intervals over entire lawn. Plugs are left on lawns to decompose. Core-aeration is recommended to help rectify compacted soil, heavy thatch accumulation, and poor drainage. Avoid this procedure when soil is quite wet.
Midmonth is a good time to apply fertilizer to lawns. Choose an organic product or a synthetic fertilizer with a 3-1-2 or 4-1-2 ratio. Moderate temperatures this month along with cool nights and adequate rainfall will spur grass growth, making September a good time to feed turf.