i'm gonna try to add tree and shrub treatment next year. wondering how important it is to have deep root feeding in a program? I have an extra skid but not sure what exactly i would need to be able to do a deep root feeding. how many GPM should i need to be putting out to properly do a deep root with some sort of injection gun? Also, i'm seeing some companies around here doing as much as 8 apps on shrubs, and some doing as few as 5 apps. I'm still trying to determine what i should do. Is it best to have a preventative program, or check shrubs with each lawn treatment and treat as needed? I've lost plenty of potential new customers this year, because i don't offer this service..