Wormgold Plus castings are produced by worms fed a specific diet rich in chitin, producing worm castings with an elevated level of recycling organisms called chitin degraders. The castings include rock dust and kelp, making a complete and natural soil amendment. This organic amendment is great for house plants, gardens, lawn, landscaping and agricultural uses. Use this mix to improve plant growth, color and taste, roots and yields, soil vitality, texture and structure.