Okay, one of my plants had a fungus and so I changed out it's soil, but I am afraid that the fungus might have spread to the other two plants (they are in pots next to one another). The guy at the nursery suggested this Garden Safe Fungicide 3. It is supposed be a fungicide, insecticide, and miticide in one. The Active ingredient is Clarified Hydrophobic Extract of Neem Oil. I've only treated my plants once (a few days ago). How long does it typically take for this to show signs of working? I just noticed a few spots in my other pots that look like they might be trying to get the fugus or whatever in them. This is the first time i've ever grown tomatoes. We did it when we were kids, but not since so i'm re-learning everything.