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Available from Coburg & Lethbridge stores.

  • Black Grit 18kg

Black Grit 18kg

  • Product Code: BG18
  • Reward Points: 4
  • Shipping Availability: In Stock
  • Maximum Quantity: 1
  • Click & Collect Availability:
  • Coburg: 4
  • Lethbridge: 3
  • $149.90
  • $55.00

  • Price in reward points: 149


1 x 18kg Black Grit


Please note that the cost of postage is calculated and set by Australia Post. Due to the weight of this product, the postage costs may be high based on your state and the location of the delivery, that’s why we have reduced the price of the product to help compensate for the cost of postage. 

***Black Grit 18kg cannot be sent to QLD, NT & WA unless postage costs are covered in addition to any other items when ordering.

Smaller sizes are available for shipping to QLD, NT & WA with free postage over $150. Orders that do not include postage at checkout when ordering Black Grit 18kg will automatically be cancelled.

Please note that the free shipping does not apply to WA, QLD & NT on this item. Please find postage costs in your CART under ‘Estimate Shipping and Taxes’.

Due to the size and weight of this item, any orders placed with other items along with this product will be sent in multiple parcels. Both parcels can be tracked with the 1 tracking number provided when items have been despatched.


Due to the weight of this product, strictly only 1 Unit Per Order is permitted.

This item is not a part of the Buy1 Get 1 Free promotion and shipping charges do apply



Two identical garden beds

With Black Grit

No Black Grit

Customer review

I am so impressed with your black grit and other grow products and the photos clearly disclose how good they are. The comparison of the 2 garden beds convinces me to be an ongoing user of them to ensure outstanding vegetable and plant growth.  I am also encouraging my family and friends to use it too. Thanks again for your great advice that really works and also for your Sat and Sun sessions on 3AW radio.

from Roger S.

Soil Health, Fertility and Sustainability

Black Grit is a fused calcium magnesium silicate phosphate soil amendment/fertilizer that has been used successfully around the world for the last century in low fertility acid soils where it increases pH and CEC (Cation Exchange Capacity) and provides and helps unlock P in the soil.
Black Grit provides soil amendment and fertilizer together in ONE application to acid soils. It assists in increasing ph to a sustainable level whilst providing useful amounts of macroelements Ca, Mg, Si, and P as well as a range of micronutrients. It is not water-soluble therefore does not leach or wash away.
Black Grit is made from naturally occurring minerals not chemically treated. It works with the natural soil chemistry to digest soil acid as well as providing minerals in a plant-available form. It is high in plant available calcium (24%), magnesium (10%) silicon (11%), and phosphorus (8%) and also acts as an alternative to lime.
Black Grit can be used as a starter in a crop or broadcast over pasture at any time of the year.
It has taken decades in some cases for soils to deteriorate, change also takes some time, but the sooner Black Grit is applied the sooner it can get to work in the soil. Typically, within 24 hours of application with some moisture Black Grit will start to digest soil acid and provide macronutrients to the plant.
Simply sprinkle 40g p/m2 around the garden and water in.
1kg of Black Grit will treat up to 20m2 garden.

Apply Black Grit every 3-6 months


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Tags: 18, black, grit, roses, blackgrit, 1.5kg, fertiliser, soil, organic, dust, magnesium, silicate, phosphate, calcium, health, natural, sprinkle, gardening

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