When I first started mowing residential, I didn't want to mess with fertilizing or weed control. Customers constantly ask me for help to improve the lawn, however, and I constantly find lawns that could look alot better. Most of the lawns I have right now have thin, yellowish St. Augustine grass (which seems to be the most common grass around here) and lots of weeds. There's a few neighborhoods that have Bermuda. In response to people asking for help I made flyers advertising pre-emergant and fertilizing services to help land more residential accounts. I'm probably getting in over my head, but I have to start somewhere. Some customers have just asked me to spread Scott's Bonus S granular fertilizer on the lawn, in the past, but this seems like it could just be a shot in the dark, if I don't really know what the lawn needs. It get's prety hot here, and I suspect that many people do not water the St. Augustine enough. Does anyone know how much water it needs? I know some companies spray Iron on the grass to make it greener. Can I do this with granular fertilizer as well? I know that in some cases the grass needs more topsoil, but I'm not sure how to tell. Should I start with a soil test?