Great for new lawns
Used this when seeding perennial ryegrass. Worked out great for soil condition and strong, fast root establishment.
VolcaMin (clinoptilolite Zeolite) - 2-4mm - 20 kg
Horticulture & Agriculture Grade
VolcaMin (clinoptilolite zeolite) is a natural soil conditioner that acts like a nutrient battery, holding and slowly releasing nutrients and water. It improves soil structure, reduces leaching, boosts cation exchange and plant efficiency.
Clinoptilolite Zeolite (High CEC)
Improves Water & Nutrient Efficiency
Fixes Fertiliser Leaching & Loss
Farms
$69.95
Last of stock. Moving to Greens Grade size only as of JULY 2026
Description
Premium Clinoptilolite Zeolite
Permanent Soil Conditioner for Nutrient Retention & Water Efficiency
VolcaMin isn’t just another soil additive; it’s a permanent soil upgrade. Think of it as a fertiliser battery: it charges up by storing valuable nutrients when they’re available, then releases them slowly as plants need them. The result? Healthier soil, stronger plants, and better fertiliser efficiency, season after season. Its highly porous, crystalline structure holds water and nutrients in the root zone, improves soil structure, and prevents leaching, especially valuable in sandy soils, high-rainfall areas, and under drip irrigation.
You should use VolcaMin in sandy or non-wettable soils, areas with high rainfall or heavy irrigation where nutrients are easily leached, or when fertiliser efficiency is poor due to nutrient lock-up. It’s also ideal for gently buffering acidic soils and supporting long-term improvements in soil productivity. VolcaMin (Clinoptilolite Zeolite) is a versatile natural mineral with a wide range of applications for households, BBQs, odour control, water treatment, and soil improvement. Its unique properties make it an essential solution for efficient cleanup, water management, and sustainable gardening.
Why choose VolcaMin (Clinoptilolite Zeolite):
- Stores nutrients and releases them on plant demand
- Prevents fertiliser waste from leaching or runoff
- Improves water infiltration and retention
- Buffers soil pH with a mild liming effect
- Boosts fertiliser efficiency and crop yield
- Works in any climate and won’t break down over time
- 100% natural clinoptilolite zeolite – safe and sustainable
VolcaMin is an eco-friendly, multipurpose product perfect for household, gardening, and water management needs. Whether it’s cleaning up spills, enhancing soil health, controlling odours, or treating water, VolcaMin delivers outstanding results while being sustainable and cost-effective.
Some alternative uses of VolcaMin are:
| For Your BBQ: | Absorbs fat and oil in grease trays, preventing mess and reducing fire risk. |
| Spills and Cleanup: | Absorbs liquids on carpets, mats, and other surfaces. Effective on motor oils, grease, and chemicals. Cleans household spills, including milk and bodily fluids. Removes animal urine from carpets and fabrics. |
| Odour Control: | Reduces and controls unpleasant odours. Doubles as cat or animal litter. |
| Water Treatment (Ponds/Dams/Fish Tanks): | Acts as a flocculant to reduce algae blooms. Filters and cleans water, improving clarity and quality. |
Give Your Soil a Permanent Advantage. Every scoop of VolcaMin is an investment in your soil’s future, locking in nutrients, holding water where plants can reach it, and preventing waste. One application lasts for years, keeping your garden, lawn, or crops thriving season after season.
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Features
VolcaMin is best described as a: Nutrient retention & efficiency system with the following benefits:
Improved Nutrient Uptake:
VolcaMin enhances the availability of essential nutrients, including nitrogen, potassium, phosphorus, and trace elements. Key results include:
- Increased nitrogen recovery in crops such as lettuce and grass.
- Enhanced potassium availability in crops like tomatoes, leading to better flowering, fruit set, and yield.
- Improved overall nutrient recovery and utilisation in a variety of crops.
Water and Nutrient Retention:
VolcaMin's porous structure acts as a natural wetting agent, improving water infiltration and capillary distribution. Benefits include:
- Holds water higher in the soil profile for consistent moisture retention.
- Prevents nutrient losses, preserving soil fertility and crop health.
Improved Fertiliser Efficiency:
VolcaMin enhances fertiliser efficiency by boosting nutrient uptake and reducing waste. Examples:
- Higher yields and improved protein content in trials with malting barley.
- Maximises return on investment by improving nutrient conversion.
Phosphorus Extraction:
VolcaMin releases locked-up phosphorus by breaking the bond between calcium and phosphorus, making it more available to plants. Particularly beneficial in:
- Phosphorus-deficient soils.
- High-calcium soils.
Enhanced Soil Structure:
VolcaMin improves soil structure by increasing porosity, aeration, and cation exchange capacity (CEC). Benefits include:
- Better root development and plant growth.
- Improved microbial activity and soil health.
- A mild liming effect that buffers acidic soils, reducing lime application needs.
Long-Term Soil Amendment:
VolcaMin is a permanent soil conditioner that does not break down or get consumed by microbes. This provides:
- Lasting benefits for soil productivity.
- Reduced environmental leaching of nutrients into waterways.
Long-Term Soil Amendment:
VolcaMin is a permanent soil conditioner that does not break down or get consumed by microbes. This provides:
- Lasting benefits for soil productivity.
- Reduced environmental leaching of nutrients into waterways.
In summary VolcaMin:
- Captures nutrients (ammonium, potassium, calcium, magnesium) and holds them in the root zone
- Releases nutrients on plant demand (cation exchange)
- Prevents leaching in sandy soils or high rainfall areas
- Improves fertiliser efficiency and nutrient recovery
- Enhances water retention and distribution in soil
- Improves soil structure, aeration, and root development
- Acts as a long-term / permanent soil amendment (does not break down)
Specifications
| Technical Highlights | |
|---|---|
| Source: | Natural clinoptilolite zeolite |
| Form: | 2-4 mm granules (horticulture & agriculture grade) |
| CEC: | Exceptionally high – nutrient “battery” effect |
| pH Effect: | Slightly alkaline (reduces lime requirements) |
| Longevity: | Permanent amendment – won’t break down |
How it Works
Case Studies and Trials:
- Malaysian Mangoes: VolcaMin improved nutrient retention, water holding, and nutrient uptake in mango crops, leading to better growth and reduced nutrient leaching.
- Echuca Tomato Trial: The inclusion of VolcaMin increased tomato yields by 10%, showcasing its ability to boost crop productivity and profitability.
- Bundaberg Tomato Trial: VolcaMin led to a 10% increase in fruit size and a 12.5% yield increase, providing significant economic benefits for tomato growers.
- University Trials: VolcaMin has been shown to increase nutrient uptake in various crops, including lettuce and sorghum, with significant improvements in nitrogen, potassium, and trace element concentrations in plant tissues.
The Science Behind VolcaMin:
VolcaMin’s power comes from clinoptilolite zeolite, a natural mineral with an exceptionally high cation exchange capacity (CEC). Its negatively charged crystal lattice attracts and stores positively charged nutrient ions like ammonium, potassium, magnesium, and calcium, holding them in the root zone until plants need them.
VolcaMin is a powerful tool for enhancing soil health and improving plant performance, offering a range of benefits that span across various crops, including tomatoes, lettuce, and grass. Its unique properties, such as high cation exchange capacity, water retention, and ability to attract and hold key nutrients like ammonium, potassium, calcium, and magnesium, make it an excellent addition to any agricultural or horticultural program.
VolcaMin offers a comprehensive solution for improving soil health, optimising nutrient uptake, and enhancing crop yields. It is an invaluable tool for sustainable farming practices, particularly in areas with poor soils or high rainfall, helping to reduce environmental impact while boosting agricultural productivity. For a deeper dive into the case studies and detailed results from trials using VolcaMin, be sure to explore our blog. We've compiled extensive information on how VolcaMin has improved crop performance, from enhanced nutrient uptake to increased yields in various agricultural settings. Whether you're interested in how VolcaMin benefits tomatoes, mangoes, or other crops, the full case studies are available for you to read. Visit the blog to learn more about the science and success stories behind this powerful soil and plant enhancer.
Application
Rates & Inclusion - APPLY ANNUALLY
| Growing Mixes | |
|---|---|
| 2.5% of mix volume | 25Kg per M³ |
| 5% of mix volume | 50 Kg per M³ |
| 10% of mix volume | 100 Kg per M³ |
| Field Application | |
| The efficiency of NPK fertilisers can be increased by the inclusion of Premium Horticultural Grade VolcaMin at 25%-50% of blend. | |
| Soil Amendment | 1-5 tonnes per Hectare |
| Tree Rates (Tropics) | |
| At Planting | 5-10 Kgs per planting hole |
| Circle Trenching | 3-5 Kgs per tree |
| VolcaMin will also remove ammonia odour from organic manures and improve the fertiliser value of VolcaMin treated manures. | |
Safety
Safety Guidelines
Keep out of reach of children. Wear a dust mask when handling large amounts. Store sealed in a dry place. Safe for organic and conventional systems. ALWAYS TRIAL BEFORE CHANGE. Before a new rate, product or application method is used, a small trial is recommended. Warranty of this material, either expressed or implied, is limited to a guarantee of the composition as shown on this label in as much as uses are beyond the seller’s control. For the same reason, the seller is not liable for any injury to any living thing, crops, soils, or materials which may result from the use or storage of this material. As this is largely a mineral-based fertiliser made from natural resources, the analysis may change slightly.
FAQ
What is VolcaMin 2–4mm?
VolcaMin 2–4mm is a coarser grade of clinoptilolite zeolite designed for long-term soil improvement, better drainage, and nutrient retention in turf, tree plantings, and poor or compacted soils.
What makes the 2–4mm grade different?
The 2–4mm size provides long-lasting structure in the soil, improving aeration and drainage. It’s ideal for use in landscape beds, around tree roots, and under turf or lawn installations.
Can VolcaMin 2–4mm help improve lawn health?
Yes. When mixed into the topsoil or under turf, it retains nutrients and moisture in the root zone, improves drainage, and supports stronger, more resilient lawns.
Is VolcaMin suitable for planting trees and shrubs?
Absolutely. VolcaMin 2–4mm is ideal for tree and shrub planting as it prevents nutrient leaching, improves soil porosity, and provides long-term root zone support.
How does VolcaMin help with fertiliser use?
VolcaMin captures and holds key nutrients such as ammonium, potassium, and calcium, releasing them gradually to reduce waste and improve fertiliser efficiency.
Does VolcaMin improve water penetration and retention?
Yes. Its porous structure helps water infiltrate the soil more effectively and distributes moisture evenly, especially useful under drip irrigation or in dry conditions.
Is VolcaMin 2–4mm a permanent soil amendment?
Yes. VolcaMin doesn’t break down or get consumed by microbes, making it a permanent addition that continuously improves soil health year after year.
Can I mix VolcaMin 2–4mm with fertiliser?
Yes. You can blend it with fertiliser or compost to improve nutrient holding and enhance overall soil performance during application.
Is it suitable for clay or sandy soils?
Yes. In sandy soils, it improves water and nutrient retention. In clay soils, it improves aeration and drainage by breaking up compaction.
Is VolcaMin safe for all plants?
Yes. VolcaMin is safe for use around lawns, trees, vegetables, flowers, native plants, and ornamentals.
Reviews
customer reviews
Showing newest first
Amazing
Was sceptical about this product when I was introduced to it but thought I would give it a shot. After laying it on the grass and giving it a good water we went away for a week and I was worried the grass would be yellow and wilted due to high heat. Came back and the grass was like a jungle. Long and strong. Held the water I had given and did everything its says.
Fantastic results
Interesting product which delivers incredible results
Great product
We have been using this product in all our potted plants and raised vegetable gardens for several months now and i can only assume it is helping because the garden has never looked better.
Warranty
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Customer reviews
customer reviews
Showing the 3 newest
Great for new lawns
Used this when seeding perennial ryegrass. Worked out great for soil condition and strong, fast root establishment.
Amazing
Was sceptical about this product when I was introduced to it but thought I would give it a shot. After laying it on the grass and giving it a good water we went away for a week and I was worried the grass would be yellow and wilted due to high heat. Came back and the grass was like a jungle. Long and strong. Held the water I had given and did everything its says.
Fantastic results
Interesting product which delivers incredible results
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Customer Reviews
First time owning lawn. Gave the team at plant doctor a ring and they supplied me with a wealth of information. Products turned up quickly.
Billy Green
Will definitely be getting more 8 weeks difference been using stimulizer, activ8mate, soil wetter, seaweed secrets and champion fertiliser. Was super fast delivery.
Michael Preddy
Only have great things to say about Plant Doctor. Organic products and a competitive price, fast shipping and easy to contact with questions. Have had great results with the special mix for lawns, and my plants (indoor and outdoor) love the seaweed secrets. I am excited to test out some of the animal products soon!
