Expert Gardener All Purpose Plant Fertilizer 12-0-12, 40 lb., is for use on trees, shrubs, flowers, and vegetable gardens. Expert Gardener All Purpose Fertilizer 12-0-12 is formulated for quick release for beautiful foliage, more vegetables and root growth. When using on flowers and vegetables spread Expert Gardener All Purpose Fertilizer 12-0-12 evenly on the bed surface and work into the top 2 to 4 inches of soil surface before planting. For shrubs, hedges and ornamentals apply in late spring and early fall..