Gaia Green: Oyster Shell Flour For Healthy Organic Plants

Sale price$19.99
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Commercial & ACMPR growers: Email us for wholesale orders


GAIA GREEN Oyster Shell Flour, the sustainable answer to soil acidity management. This renewable alternative to mined limestone boasts an impressive ability to restore soil pH levels effectively. With just a single application, you can enjoy improved soil properties that last for years. Whether you're tending to small gardens or expansive landscapes, GAIA GREEN Oyster Shell Flour is the perfect choice for achieving the desired increase in soil pH. Elevate your gardening experience with this exceptional product, designed to enhance the health and productivity of your plants by addressing soil acidity.


GAIA GREEN Oyster Shell Flour is approved for use in organic agriculture by Ecocert Canada (in compliance with Canada’s Organic Production Systems General Principles & Management Standards and Permitted Substances Lists (CAN/CGSB 32.310-2015 and CAN/CGSB 32.311-2015)


    • An excellent source of slow release calcium.

    • Equivalent to limestone for ameliorating soil acidity.

    • Renewable resource.


      Calcium (Ca)....................................36.0%

      Neutralizing value (CaCO3)..............96.0%

      Passes 100 mesh TYLER Screen.......30%


        Gardens and Landscapes: For reducing soil acidity, broadcast and incorporate 0.5 - 6.75 kg per 10 m2 (1 - 13.8 lbs per 100 ft2). For equal pH adjustment sandy soils require a lower rate compared to clay soils and those high in organic matter. Consult an agronomist to determine appropriate rates for your garden soil.

        Field: Consult an agronomist to determine an appropriate application rate. Typical rates are between 560 to 6700 kg per ha (500 to 6000 lb per acre).

        Top-dressing hanging baskets, potted plants, and planter boxes: Mix in 15 ml per 4 L (1 tbsp per gallon) of soil or growing media. Apply monthly or as desired. Effects of this product on soil pH may take in excess of 1 year to be fully realized. 

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