Theres all kinds... Teas, Worm castings, fish emulsion, bat/bird guano, GREENSAND, Manure, Compost...ect. If mother earth made it, its organic. You'll have to goto a story with a larger selection (nurseries, gardening suppy stores). Also If you do go organic and get bored one day, throw some worms in the pots. They will leave worm casting with high nitrogen and also they help the roots get oxygen.