Down To Earth Oyster Shell, OMRI, 5 lb.

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.

• Help prevent calcium deficiencies that can diminish plant development. 
• Approved for use in organic crop production. 
• Mix and match single ingredient fertilizers to create specialized NPK recipes to precisely control plant nutrition at every stage of the growth cycle.