For All Bulbs – Spring and Fall Bulb-tone is a premium plant food 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 plant food to ensure superior plant growth. Bulb-tone feeds slowly, safely, and will provide a long lasting food reservoir to ensure superior results. All natural plant food for all spring and fall bulbs •Perfect for all bulbs like tulips, daffodils, crocus and hyacinths. •Rich in bone meal and other natural organics. •Provides complete, balanced feeding.