Earthworm castings are a natural by-product of the worm business. It is estimated that one commercial growing bed 3' X 8' will produce 800 pounds of pure casting yearly. Earthworm castings are the best imaginable potting soil for greenhouses, or house plants, as well as gardening and farming. It will not burn even the most delicate plants.
All nutrients are water-soluble, making it an immediate plant food.
Earthworm castings can also be used as a planting soil for trees, vegetables, shrubs and flowers. They may be used as a mulch so that the minerals leach directly into the ground when watered, or they may be used for area or row composting. The effects of earthworm castings used in any of these ways are immediately visible. They make plants grow fast and strong enabling them to fight off diseases. Composting is the biological breakdown of organic material into dark, soil-like material called humus.