Espoma Garden-tone 3-4-4 Herb & Vegetable Food is an all-natural plant food formulated specifically for vegetable gardens. It is safe, long lasting, and will provide the nutrients necessary for vigorous and productive plants. Garden-tone's all natural formula contains Bio-tone®, a proprietary blend of beneficial microbes. Bio-tone biologically enhances natural plant food to ensure superior plant growth. Long-lasting, slow release. Won’t burn or leach away.