Black Gold(R) Earthworm Castings Blend gives gardeners a natural way to feed their soil and their plants. Enrich all of your garden plantings with fertile, nutrient-rich Black Gold(R) Earthworm Castings Blend. Use of to fortify vegetable gardens, containers, and flower beds. | Sun Gro Black Gold Earthworm Castings Blend Natural and Organic Soil Conditioner | Size 8 qt