Vermiculite Coarse (3-6mm)

2 reviews

Size: 100L
Sale price$57.00

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Vermiculite is indeed a versatile mineral that offers several benefits for gardening and horticulture. When incorporated into potting soils and gardening mixes, it can significantly improve soil quality and help plants thrive.

  1. Enhanced Moisture Management: Vermiculite has excellent moisture retention properties, allowing it to absorb and hold water. This moisture is then gradually released to plant roots, helping to prevent both drought stress and waterlogged soil conditions.

  2. Improved Aeration: Vermiculite's structure creates air pockets within the soil, facilitating better drainage and oxygen penetration to the root zone. This promotes healthier root growth and reduces the risk of root diseases caused by poor aeration.

  3. Nutrient Retention and Release: Vermiculite can retain essential nutrients like potassium, calcium, and magnesium. It releases these nutrients gradually over time, providing a consistent supply to plants as they grow. This can reduce the need for frequent fertilization.

  4. pH Neutrality: Vermiculite is pH neutral, meaning it won't significantly alter the acidity or alkalinity of the soil. This allows gardeners to maintain the desired pH level for specific plant varieties.

  5. Lightweight Texture: Vermiculite's lightweight nature makes it easy to handle and mix into potting soils and container gardening mixes. It adds volume without adding excessive weight, which is especially beneficial for potted plants.

  6. Temperature Regulation: Vermiculite's insulating properties help regulate soil temperature. It acts as a buffer, keeping the soil warmer in cold conditions and cooler in hot weather. This temperature stability benefits plant roots.

  7. Disease Mitigation: Although not a direct disease control measure, vermiculite's ability to maintain proper moisture levels and aeration can indirectly reduce the risk of soil-borne diseases by creating a healthier environment for plant roots.

  8. Seed Germination: Vermiculite's fine texture and moisture-retentive qualities make it an ideal medium for starting seeds. It provides a stable and supportive environment for delicate seedlings to establish themselves.

By incorporating vermiculite into gardening mixes, gardeners can create an optimal growing environment that fosters healthy plant growth, conserves water, and minimizes the risk of common gardening challenges like overwatering and poor drainage.

Unique Properties:

  • Lightweight: Vermiculite is incredibly lightweight, which makes it an excellent choice for applications where weight matters, such as lightweight concrete and potting soils.
  • Inorganic (Incombustible): Vermiculite is inorganic and incombustible, meaning it doesn't burn or support combustion. This property is essential for fire protection and as a component in construction materials that require fire resistance.
  • Compressible: It can be compressed for various uses and then expanded when subjected to heat.
  • Highly Absorbent: Vermiculite can absorb and hold water, making it useful in horticulture and as a carrier for various chemicals.
  • Non-Reactive: It does not react with other substances, contributing to its stability in different applications.


  • Horticulture: Vermiculite is a common component in potting soils and growing mixes. Its moisture-retentive properties help maintain adequate soil moisture levels for plants.
  • Construction: It is used in lightweight concrete and as a fire protection material in construction.
  • Packaging: Vermiculite is used as a packaging material for the safe shipment of hazardous liquids. It provides cushioning and absorption properties.
  • Coatings and Texturizers: In the paint and coatings industry, vermiculite is used as a texturizer and filler. It can enhance the texture and performance of coatings.
  • Nanocomposites: In recent years, vermiculite has found applications in nanocomposites for films, coatings, and barrier materials due to its unique properties.
  • Exfoliation: When exposed to heat, vermiculite undergoes exfoliation, expanding into worm-like pieces. This expanded vermiculite is used in a range of applications due to its increased volume and insulating properties.


During the exfoliation process, vermiculite can expand to 8 to 12 times its original bulk volume, although individual flakes may exfoliate as much as 30 times. The color of the expanded vermiculite can change depending on its composition and the temperature at which it's expanded.

Bulk Density

The bulk density of crude vermiculite or vermiculite concentrate typically falls within the range of 640-1120 kg/m³, while exfoliated or expanded vermiculite has a lower bulk density, usually in the range of 64-160 kg/m³.

Vermiculite's diverse range of properties and applications make it a valuable and unique mineral in various industries, from agriculture and construction to packaging and materials science.

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Customer Reviews

Based on 2 reviews
Great stuff

High quality, reasonably priced and friendly service :)

Potting media

Shipping was super quick and my plants are loving the quality media I am using in my aroid mix from Dr Green Thumbs! All items were as described and in great condition. All round quality service!

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