what i would like to know is when is a better time to put down fertilizer? after aeration and before overseeding or after aeration and overseeding? before you tell me put down a starter fert after both services listen to this. my lesco rep told me that where i live there is so much phosphorus in the soil you don't need starter fertilizer. so, here is what i'm working with. my schedule is going to consist of renting an aerator and doing all my aerations in a week, then the next week renting a slice seeder and doing all of the overseedings then. for customers who are due for their application of an organic based fert (15-3-7) when do you think is the best time to apply this? i am obviously not going to spot treat the weeds like normal, but was wondering suggestions on when to apply their fertilizer application. i was thinking after the aeration and before the overseeding. or should i hold off for maybe 3 weeks even though they are due for an application?