Oyster Shell Flour
Oyster Shell Flour Label for 4 or 10 Pound Package
Oyster Shell Flour Application Rates
Oyster Shell Flour Soil Amendment

Oyster Shell Flour | RMBA

Regular price$20.00
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Sweeten your soil and provide your plants with a healthy source of slow-release calcium with Oyster Shell Flour from Rocky Mountain BioAg®.

This supplement offers a rich addition of lime, also known as calcium carbonate, and is a great soil amendment for use in organic growing. Contains 100 percent pure oyster shells sourced from the Pacific Ocean, finely ground for easy application. 

Calcium isn't the only nutrient this product provides. Our Oyster Shell Flour also adds trace elements like nickel, copper, zinc, and molybdenum and helps raise the pH of acidic soils. In addition, thanks to a slow-release formula, this amendment conditions soil over a long period of time, allowing infrequent applications and cost savings.

Gardeners aren't the only ones who will fall in love with our Oyster Shell Flour. The fine grind of this blend makes it a perfect choice for surfacing traditional Italian bocce ball courts. Using our Oyster Shell Flour on your bocce ball playing surface allows the balls to track straight and roll fast while absorbing bounce and promoting drainage. 


  • Made from 100% pure, all-natural Pacific oyster shells
  • Great source of calcium
  • Contains trace elements, including molybdenum, copper, nickel, zinc, and more
  • Raises the pH of soil
  • Slow-release formula
  • Great for surfacing bocce ball courts

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      Biological... Beyond Organic®

      Organic is just the start

      RMBA is committed to provide natural and organic products that support healthy soils. Even if a product is not listed as 'organic' you can rest assured that it will help, not hurt your soil.

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      This has been the best pumice i have ever used!!! Besides the great customer service (*****)

      Ricardo S

      McAllen, TX


      Rocky Mountain BioAg has the best customer service! Prompt delivery and product support. Thanks !

      Joe B

      South Kingstown, RI


      I have a greenhouse that unfortunately does not get the ideal sunlight due to its location on the north side of my home. I have been using Rocky Mountain BioAg’s Quantum Growth Organic Total for over a year and have seen a dramatic increase in plant growth and vegetable yield compared to past years. Highly recommend the product.

      Jack C

      Sarasota, FL


      Excellent customer service, quick response, fast turnover and shipment of merchandise and product was exactly what was described on website and what I wanted. Great Company!

      Jessica S

      Harrisonburg, VA