The Espoma 4 lb. 66 sq. ft. Organic Earthworm Castings are 100% pure with no additives or fillers. Earthworms are fed a proprietary diet of exceptional natural and organic feedstocks. The result is a safe, non-toxic and all natural organic fertilizer and soil conditioner that produces vigorous plant and root growth while improving soil structure. The 66 sq. ft. of coverage provides enough earthworm castings to cover and feed your entire yard.

Looking for more information on fertilizer? Check out our guide on how to read fertilizer numbers in the product documents section.