• Gaia Green Oyster Shell Flour - 20 KG
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Product benefits

  • Soil Acidity Support
  • pH Stability
  • Calcium Support
  • Soil Structure Support
  • Better Nutrient Uptake
  • Organic Matter

This product may offer additional benefits beyond those listed.

Frequently purchased together

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Provision Gardens is an official reseller of this brand.

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Gaia Green Oyster Shell Flour - 20 KG

Vegetative Stage Flowering Stage Indoor Outdoor Coco Coir Safe Soil Soilless Organic

OTHER AVAILABLE SIZES / MODELS:

Store Availability
In-Store Pickup Only

Product benefits

  • Soil Acidity Support
  • pH Stability
  • Calcium Support
  • Soil Structure Support
  • Better Nutrient Uptake
  • Organic Matter

This product may offer additional benefits beyond those listed.

Description
Description
Gaia Green Oyster Shell Flour is a Gaia Green mineral soil amendment for reducing soil acidity and supporting a higher soil pH in gardens and landscapes. It’s built for growers who want a simple, natural input that improves soil conditions over time while also supplying calcium.

This product is positioned as a renewable alternative to mined limestone, with a comparable capacity for ameliorating soil acidity. In practical terms, it’s a straightforward soil pH adjustment option for beds and landscapes where the goal is to move away from overly acidic conditions. Gaia Green also notes that a single application can improve soil properties for several years, which makes Oyster Shell Flour a good fit for long-term soil building rather than short-lived, quick-change inputs.

A key benefit of Gaia Green Oyster Shell Flour is that it’s an excellent source of slow release calcium. That calcium contribution supports the root zone in a steady way, aligning with the product’s long-lasting soil improvement focus. The ingredient story stays clean and easy to trust: it is derived from oyster shell flour, with no blended fertilizer complexity and no need to interpret a long list of additives.

Because the purpose is clearly tied to soil acidity and pH direction, the buyer intent stays simple. This amendment is an excellent choice for all gardens where increased soil pH is desired, especially when you want a familiar limestone-style role from a renewable resource. It’s also a practical option for growers who prefer to make targeted, single-input adjustments to their soil program, keeping the approach focused on soil conditions instead of chasing multiple variables at once.

Gaia Green Oyster Shell Flour is suited to gardens and landscapes, and it also fits container contexts such as hanging baskets, potted plants, and planter boxes. It is recognized by Ecocert Canada for use in organic agriculture, supporting organic-minded growing styles that prioritize simple inputs and soil health.

If you’re working with acidic soil and want a renewable resource that is equivalent to limestone for ameliorating soil acidity, Gaia Green Oyster Shell Flour is a clean, mineral-based choice. This product is a strong fit for growers who want slow release calcium and long-lasting soil improvement, with a clear goal of supporting healthier soil conditions and a more favorable soil pH.
Product benefits
Vegetative Stage; Flowering Stage; Indoor; Outdoor; Coco Coir Safe; Soil; Soilless; Organic; Soil Acidity Support; pH Stability; Calcium Support; Soil Structure Support; Better Nutrient Uptake; Organic Matter.
Guaranteed analysis
Calcium (Ca): 36.0%; Neutralizing value (CaCO3): 96.0%.
Derived from
Oyster Shell Flour.

Warnings & Safety
Important – Safety Information

This product may cause mild skin irritation and eye irritation. Avoid unnecessary contact with skin, eyes, and clothing. Use only as directed.

General Safety Precautions

Read and follow all instructions on the product label and any accompanying documentation before use. Keep out of reach of children and pets. Do not ingest. Avoid breathing vapours, mist, or dust that may be generated during handling or use.

Wear appropriate personal protective equipment (PPE), such as protective gloves, long sleeves, long pants and closed-toe footwear. When there is a risk of splashing or airborne particles, use safety glasses or other suitable eye and face protection.

First Aid – Skin Contact

IF ON SKIN OR HAIR: Remove contaminated clothing immediately. Rinse skin with clean water for several minutes, then wash with mild soap and water. If irritation or redness develops and persists, seek medical attention. Wash contaminated clothing before reuse.

First Aid – Eye Contact

IF IN EYES: Rinse cautiously with clean water for several minutes, keeping eyelids open. Remove contact lenses if present and easy to do. Continue rinsing. If irritation persists, obtain medical advice.

First Aid – Ingestion

IF SWALLOWED: Rinse mouth thoroughly with water. Do not induce vomiting unless instructed by a medical professional. Seek medical attention if you feel unwell.

First aid – Inhalation

IF INHALED: Move the person to fresh air and keep them comfortable for breathing. If coughing, breathing difficulty, dizziness or other symptoms occur, seek medical assistance.

Storage And Handling

Store this product in its original closed container, in a cool, dry and well-ventilated area. Protect from extreme temperatures and direct sunlight. Keep container tightly sealed when not in use.

Avoid release to drains, natural waterways or outdoor soil. Dispose of unused product and empty containers in accordance with local regulations and the directions on the label.

Important – Medical

If medical advice is needed, keep the product label or container available. Always follow the specific instructions and safety recommendations provided by the manufacturer. This safety notice is intended as general guidance and does not replace official label directions or documentation.

Guaranteed Minimum Analysis
Calcium (Ca) 36.0%
Neutralizing value (CaCO3) 96.0%

Derived From
Oyster Shell Flour

Frequently Asked Questions
Why is calcium important for plant growth?

Calcium is important because it builds and stabilizes plant cells as they form, acting as the structural support that keeps new growth strong and functional. Unlike other nutrients that drive color or speed of growth, calcium’s role is unique because it controls cell wall strength and membrane stability, making it essential for healthy roots, shoots, and long-term plant resilience rather than quick visual results.

Read the full guide

Why is neutralizing value (CaCO3) important in plant growing?

Neutralizing value (CaCO3) is important because it tells you how strongly a material can neutralize acidity and stabilize root-zone pH, which directly controls nutrient availability and healthy root function—and it’s unique because it measures long-term acid-neutralizing capacity, not just a single pH reading.

Read the full guide

What does oyster shell flour do for plants?

Oyster shell flour slowly releases calcium carbonate to buffer the root zone and help keep nutrient uptake steady over time, which makes it different from fast-acting calcium sources that work quickly but don’t stabilize pH for long. It’s important because stable root-zone conditions reduce pH swings that can trigger deficiency-like symptoms even when nutrients are present.

Read the full guide

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