Bulb-Tone is a premium organic fertilizer formulated specifically for bulbs and tubers. It contains bone meal and other natural organics to meet the special nutritional needs of these plants. Bulb-Tone's all natural formula contains Bio-tone®, our proprietary blend of beneficial microbes. Bio-tone biologically enhances our natural organic fertilizer to ensure great plant growth. Bulb-Tone feeds slowly and will provide a long lasting nutrient reservoir to ensure great results.