Description
Natural Coral Calcium to Strengthen Soil Biology and Plant Nutrition
Aragonite / Oyster Shell Flour from The Soil Makers is a premium natural calcium amendment derived from coral sea deposits. This finely ground mineral provides a powerful calcium source that supports soil biology, improves mineral balance, and enhances nutrient availability in living organic soils.
Containing 97% calcium carbonate and calcium silicate, this amendment delivers 33–40% available calcium, helping promote strong root development, improved nutrient uptake, and healthier plant growth.
Unlike many calcium sources, aragonite is low in magnesium, making it an excellent alternative to lime for growers seeking to increase calcium levels without raising magnesium levels in the soil.
Aragonite also supports soil microbial activity, helping strengthen the soil food web and improve nutrient cycling. This makes it especially valuable in living organic soil systems, compost blends, raised beds, and regenerative gardening practices.
The finely ground flour texture allows for easy incorporation into soil mixes and amendments.
Key Benefits
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High-quality coral sea calcium source
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Contains 97% calcium carbonate and calcium silicate
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Provides 33–40% available calcium
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Low magnesium profile compared to many lime products
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Supports soil microbes and biological soil activity
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Helps improve nutrient availability and mineral balance
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Ideal for living organic soil systems
Trace Mineral Profile
Aragonite naturally contains additional trace minerals that contribute to soil health:
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Fe₂O₃ – 0.025%
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Al₂O₃ – 0.15%
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MgCO₃ – 1.50%
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SO₃ – 0.20%
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NaCl – 1.25%
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SrO – 1.25%
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SiO₂ – 0.88%
How to Use
Mix 1–2 cups per cubic foot of soil as part of a balanced nutrient and mineral amendment program.
Suitable for:
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Living organic soil blends
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Raised beds and garden soils
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Container gardens
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Compost systems
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Soil rebuilding programs
Additional Uses
This mineral flour can also be used as a top surface layer for bocce courts, where its fine texture and natural mineral composition create a durable playing surface.
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