Pure Earthworm Castings are an incredible organic fertilizer and soil conditioner that is of unsurpassed fertility. Because it has an abundance of readily available, non-burning nutrients, you add only a little in your plants. Earthworm castings go much farther and produce results that are simply far superior to those of conventional manures, compost or other organic fertilizers. You will see definite differences in the yield, size, health, and color of your vegetables, fruit, flowers, houseplants, lawns and more. 3 kg.