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.

Common Questions about Black Grit:

Is Black Grit organic? Black Grit is an organic controlled release, sustainable fertiliser that will not burn your plants.

How often do you use Black Grit? Every 3 – 6 months

What is Black Grit made from? Black Grit 0-8-0 is a blend of Rock Phosphate and Limestone 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.

Is Black Grit a good fertiliser for fruit trees? Black Grit is a fantastic controlled release, organic fertiliser for fruit trees. It will create stronger growth, better flowering and bigger and juicer fruit. Black Grit provides long lasting plant nutrient availability with low run-off or leaching.

How to Use:

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

Available in:

1.5kg & 4kg
18kg available upon request