I HAVE NOTICED IN THE PAST SEVERAL days that alot of landscapers around have been aerating now and seeding. how can they be putting on a pre emergent (there not using tupersan..ithink that whats its called), that will not allow the seed to germinate. either thaey dont no thats the case or they dont care i guess. i do al my aerating and seeding in the fall. after i hot dry summer it is the best thing you can do for a lawn. the lawns fill in greaT and the new grass roots can strenthen and mature oveer the winter making it come up great in the spring and is more drounght tolerant. if you aerate and seed in the spring the hot dry summer wikk come and probly kill the new grass for good because the roots hadnt had that long to develope. why do people aerate in the spring instead of fall? i can understand if your not seeding but if your seeding its almost a waste of time.