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Detroit Nutrient Company worm castings set the standard for quality in vermicompost. The worms are fed a fixed diet, and left to create a high-quality casting that is excellent for use in soil building, top dresses, amending and making inoculation and compost A.A.C.T. Indoors for use with bottle nutrients, a handful of castings in every planting hole increases plant vigor and health as well as adding to yield.