I sprayed herbicide on a customers yard and did a complete over kill and went back 18 days later and core aerated heavily and reseeded. The lady did not want to pay for the fertilizer at the time. Well it has been 4 weeks from today that I aerated and reseeded... She has called and wants fertilizer because the grass has come up but just is not growing much larger than 2 inches. Is fertilizer the only problem? If so, should a use my Lesco and spray fertilizer on or use granular?