a customer of mine, a good customer would like some sort of weed preventing and fertalizer this year. I do not do this for all customers, just one. Can i use a scotts fert with weed preventer or crabgrass preventer? he also wants the lawn re-seeded. how long would i have to wait to reseed after the fertalizer. Am i right in assuming i could not fertalize newly grown grass seedlings that are less than a month old?