Soil Health. Fertility. Long-Term Growth.
More Flowers. More Fruit. Stronger, Healthier Plants.
WHAT IS BLACK GRIT?
Black Grit is a natural fused mineral blend rich in calcium, magnesium, silicon and phosphorus.
It works with your soil, not against it, breaking down slowly through microbial activity to improve soil structure, support long-term fertility and help move nutrients where plants need them most.
Unlike soluble fertilisers, Black Grit does not leach or wash away. It stays in the soil, building strength over time.
WHY USE IT?
Black Grit is more than just a fertiliser, it’s a soil builder.
It helps:
- Improve soil structure and condition
- Increase nutrient holding capacity (CEC)
- Support microbial life and soil biology
- Unlock tied-up nutrients, especially phosphorus
- Deliver slow-release mineral nutrition over time
In low fertility or acidic soils, it also helps balance pH naturally while feeding the plant at the same time.
WHAT MAKES IT DIFFERENT?
Black Grit is made from naturally occurring minerals that have been fused together, not chemically treated.
This creates a stable, slow-release mineral source that:
- Won’t burn plants
- Won’t leach away
- Works with natural soil processes
- Feeds both the soil and the plant
Think of it as the foundation layer that supports everything else you add.
HOW TO USE BLACK GRIT
Black Grit is easy to apply and fits into any garden routine.
Seedlings
Mix a small amount into the soil before planting. Water in well.
Established gardens
Move mulch aside, sprinkle around plants, lightly scratch into the soil, then water deeply.
Trees & shrubs
Apply in a wide ring under the drip line. Rake in lightly and water well.
Works best when used alongside organic matter and a living soil system.
APPLICATION RATES
(1 handful ≈ 50g)
Garden beds
Apply 1–2 handfuls per m² and mix into topsoil
Pots & planters
Use a small pinch up to ½ handful depending on pot size
Top dress
Reapply every 3–6 months as needed
COMPOSITION
Natural fused minerals containing:
- Calcium (24%)
- Magnesium (10%)
- Silicon (11%)
- Phosphorus (8%)
- Plus trace micronutrients
- Suitable for all garden types including fruit trees, vegetables and ornamentals
- Apply at reduced rates (¼ strength) for Australian natives
- Safe, slow-release and non-burning
Is Black Grit organic?
Black Grit is a naturally derived mineral fertiliser that works with biological soil processes. It is not chemically treated and supports organic growing systems.
How often should I use it?
Every 3–6 months, depending on soil condition and plant demand.
Is it good for fruit trees?
Yes. Black Grit supports stronger growth, better flowering and improved fruit development by supplying long-term mineral nutrition.
What is it made from?
A fused blend of naturally occurring mineral sources including calcium, magnesium, silicon and phosphorus.
Since we have been using Black Grit for the last few years we have had an increase in the volume and quality of our lemon and orange trees. Initially the navel oranges were were small and thick skinned, now the skin of the navel oranges has reduced by at least 50 percent and their size has increased and the sweetness is fantastic, the eureka lemons also now have much thinner skins and very juicy. Our bedding plants - dahlias and daffodils blooms and flowers are the best we have ever had. Cheers David
Love Black Grit we have been using it for years, we started with a bulker bag for the farm to use on a plantation of young trees in several plantations and they are super healthy and grew really well. I now use it with the super foods in the garden and wouldn,tt use anything else
Love the Black Grit but I did not receive free Super food
Black grit is an amazing product. I have previously bought 2 of the 18kg tubs and now the 10kg. Our box hedge is lush and green due to the black grit and everyone else in our neighbourhood has very rusty looking hedges. I use it on everything else as well
Great Product and easy to use.. Just wear good gloves as there are some sharp crystally bits in it
Good products. Been using Black for a few years and find plants/trees do well.
Excellent stuff.
Early days, but really good so far
Top notch product. The plants love it
Repeat customer of Black Grit. Plants definately appreciate the addition of this to the clay soil. Leaves are greener and plants are looking healthier.
Since using black grit my plants seem a lot healthier. Even the neighbours are starting to comment.
Yes Black Grit is true grit - Used in conjunction with natural fertiliser it helps the natural fertiliser to benefit the plants. Noticed on the Roses less amount of thrips and the leaves have less rust on them and looking more healthy. Other plants also looking more healthy showing steady growth by using Black grit with natural fertiliser. Thoroughly recommend it.
Frequently asked questions
Is Black Grit Organic?
Yes, Black Grit is an organic, sustainable fertiliser that safely nourishes your plants without the risk of burning. Its controlled release formula ensures that your plants receive the right amount of nutrients over time.
How Often Should I Use Black Grit?
For optimal results, we recommend applying Black Grit every 3 to 6 months. This frequency ensures that your plants consistently
receive the nutrients they need for robust growth and health.
What Is Black Grit Made From?
Black Grit is naturally crafted from a blend of Rock Phosphate and Limestone, ingredients that have proven their worth globally for over a century. This mix not only increases soil pH and Cation Exchange Capacity (CEC) but also unlocks and makes phosphorus more available in the soil, enhancing plant growth in low fertility, acidic soils.
