Oyster Shell is an all-natural and high-quality source of the essential plant nutrient calcium.
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. Oyster Shell also aids in improving structure of soils and building optimum tilth.
Oyster shell can be used as an alternative to lime. Both are composed of calcium carbonate, which is an alkali, and therefore raises the pH of the soil, increasing the plant's ability to take up other micronutrients such as zinc, iron, and manganese.