Crushed Oyster Shells


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Crushed oyster shells are a great source of calcium for use in the garden or potting mixes. Calcium helps balance soil pH and improves nutrient uptake. The particle size is in the 1/8″–1/4″ range, which is perfect for inorganic mixes. In the garden, we add it at a rate of roughly 2.5-5 lbs per 100 square feet. For outdoor pots, 1-2 Tablespoons per gallon of soil. For calciphiles like Cypripedium candidum, we use it as part of a 1:1:1:1 mix of calcined clay, perlite, granite grit, and oyster shells.

Additional information


1#, 4#

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