Finding safe, non-toxic pesticides for the garden that actually work can be a challenge. We all want to protect the environment, our families and our food, but most non-manmade chemicals available have limited effectiveness. Except for neem oil. Neem oil insecticide is everything a gardener could want. What is neem oil? It can safely be used on food, leaves no dangerous residue in the soil and effectively reduces or kills pests, as well as prevents powdery mildew on plants.