If your lawn gets too much love from the family pet — like mine does — it could benefit from aerating. Keep your lawn and landscape healthy and green – the envy of the whole neighborhood. When using a preemergent weed control program for annual weed control, do not apply a preemergent weed types of lawn grass control product before aerifying. The aerifying process will open up the protective layer of herbicide and allow weeds to grow. Make all preemergent herbicide applications after the turf has been aerified. Aerification can be combined with seeding, particularly on sparse or bare areas.