Does anyone have suggestions for organic lawn fertilizers and pesticides that actually work? We recently moved to a home that backs up to a large pond. We have St. Augustine grass but it needs to be fertilized as the weeds are taking over. Also have grubs and ants. I've always used non-organic in the past, so I'm new to this since we now have a pond with lots of wildlife and fish to protect. We want to maintain a nice lawn, but not to the detriment of the pond. Any advice would be much appreciated.