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Earthen Organics Worm Castings 2 Gal.Earthen Organics worm castings are Mother Nature's plant food. Worm castings are a natural soil amendment that you add to the soil when planting or brew into a tea to spray on plants. With small amounts mixed into the soil, plants grow larger and healthier. At Earthen Organics the worm castings are filtered using a 1/8" screen so that our customers receive a higher concentration of pure worm castings than those producers who use a 1/4" screen. Earthen Organics