Down To Earth’s Oyster Shell is an all-natural and high-quality source of the essential plant nutrient calcium. Ancient oyster shells are carefully harvested and then ground into small, medium and coarse particles. These irregular shapes provide a sustained release of this valuable nutrient. DTE Oyster Shell also aids in improving structure of soils and building optimum tilth. Listed by the Organic Materials Review Institute (OMRI) for use in organic production.

Ingredients Ground Oyster Shell (Calcium 35%)