Horticultural Zeolite (BFA Certified Organic)
Zeolite is an organic mineral additive that attracts and retains fertilisers and releases them when the plant needs it, preventing soil nutrient leaching. Suitable for virtually all plants. Especially popular for growing Bonsai and Roses.
An open mix with high air porosity and good drainage is crucial for stimulating root growth and preventing many root diseases; however, it also leads to the rapid leaching of nutrients away from the root zones of plants. Zeolite prevents this by attracting and holding the nutrients, preventing them from washing through the container.
The typical approach to growing crops has been to apply high rates of fertiliser to overcome the losses due to leaching. This is both expensive and inefficient, as well as environmentally damaging in terms of high nutrient runoff.
Zeolite works as a fertiliser battery, charging when free nutrients are available, holding them from leaching and releasing them to plant demand as required. Zeolite is not affected by temperature and buffers the dumping of nutrients by coated fertilisers under hot conditions, holding them for use by the plant instead of driving your dams’ E.C. through the roof!
Main Features:
- Captures nutrients lost when coated fertilisers are dumped in tropical conditions.
- Attracts and retains nutrients for use by plants.
- Reduces nutrient loss through leaching.
- Slowly releases nutrients as plants want them.
- Improves cation exchange capacity (CEC)
- Buffers Ammonium in mixes.
- Improves the quality of runoff water.
- Improves the value of fertiliser.
- Assists with water infiltration.
- Strong capillary distributor.
- Improves plant performance.
- Does not break down in the mix.
Size guide:
Fine Grade 0.7 to 2mm - For general horticultural use in potting mixes and garden soils. Great for virtually all plants.
Medium Grade 2 to 4.4mm - For Bonsai and some other plants
Coarse Grade 4 to 6mm - For Bonsai and some other plants.
Application Rates:
As a general guide, it's suggested to mix at least 1.25 kg of zeolite with every 25 litres of soil or potting mix, which is equivalent to 50 g per litre of soil. According to the manufacturer, you can even use higher rates if you prefer, up to 50/50 with the soil; however, the 1.25kg per 25L rate is the minimum amount for optimal results. Sandy soils will likely benefit from higher application rates. Roses can also do with more.
More Information:
The use of Zeolite will soak up excess ammonium and other cations in mixes often released under hot conditions, preventing root burning. Zeolite is marginally alkaline and a source of available calcium, so its use with fertilisers can help buffer pH levels, thus reducing the need for lime applications.
Zeolite carries a negative ionic charge which naturally attracts positive charged cations like ammonium, potassium, magnesium and calcium. The open crystalline structure of zeolite has numerous storage sites for these ions, which are held naturally through weak chemical bonds. These fertiliser ions are available to plants. Zeolite has a very high cation exchange capacity, thus increasing the mix's ability to hold and release nutrients. As cations are water-soluble, they escape from mixes by leaching.
Zeolite is also an excellent capillary distributor of water due to its highly porous properties, assisting infiltration, holding water higher in the pot, and distributing water and nutrients more evenly through the mix, which is important especially under drip irrigation. You get better value from your fertiliser dollar, improved plant growth, and reduced nutrient load in your runoff and collected water, thereby reducing the E.C. levels of your storage.
Frequently Asked Questions:
Q. Is this zeolite suitable for outdoor ponds, and if so, which grade do you suggest?
A. When I asked the manufacturer, I was told the following: "Yes, Zeolite is suitable for outdoor ponds. The 4-6mm grade would suit well, depending on the size"
Q. Is this zeolite suitable as a cat litter?
A. After emailing the manufacturer, I was told that this zeolite is suitable as a cat litter.
Q. Does your zeolite include Clinoptilolite?
A. From Manufacturer: "Yes, it is a calcium/magnesium clinoptilolite. It's formed under a freshwater lake, and hence the sodium content is low"
Q. Which zeolite grade is best for growing bonsai?
A. The best zeolite grade for growing bonsai depends on the species, stage of growth, and personal preference, but generally:
- 0.7 to 2mm: Best suited for seedling propagation or as a component in fine soil mixes for very young bonsai. It retains more moisture and provides better root contact.
- 2 to 4.4mm: A versatile choice, often used for small to medium-sized bonsai. It provides good drainage and aeration while still retaining some moisture.
- 4 to 6mm: Ideal for larger bonsai or species that prefer excellent drainage. It allows more air around the roots and reduces the risk of overwatering.
For most bonsai enthusiasts, 2 to 4.4mm is the best all-around choice, balancing moisture retention and aeration. However, mixing sizes can optimise soil structure depending on your tree’s needs.