Bulb-tone is a premium plant food formulated specifically for bulbs and tubers. It is made from natural and organic plant food ingredients including bone meal and contains no sludges or fillers. The Organics in Bulb-tone break down gradually to provide a long lasting food reservoir throughout the growing season. We also add Bio-tone a proprietary blend of microbes that biologically enhances our plant food to ensure superior plant growth. And because every ounce of Bulb-tone is manufactured in our state of the art, solar power plant, quality and consistence are guaranteed. Use Espoma Bulb-tone with the confidence that you have chosen the very best. Espoma - the most trusted name in organics since 1929.