• $40.00/ Cubic Yard

Black granite screenings (stone dust, decomposed granite)

Material Calculator

Disclaimer: This calculation tool is for general use only and provides only an approximate estimate of product requirements. Ferndale Gardens makes no claims as to the accuracy of the calculation below and recommends its use at your own risk and satisfy yourself of the product quantity to purchase.

What is granite screenings?

Granite screenings (stone dust) consists of fine grains of granite. This products is made by crushing and sieving granite. The finest fraction after sieving is granite screening.

Usage of stone dust between pavers and under pavers

Stone dust is used as leveling material under flagstones and paving stones due to its capability to compact well and pass the water. It is also used to fill cracks between pavers. You can read Dirk Braen's post for more detail about benefits and drawbacks of stone dust in comparison with sand.

It is also used in soil improvement.

Decomposed granite for soil amendment

Granite screenings improve both drainage ability of the soil as well as its micro-nutrient composition. Crushed stone dust gradually releases micronutrients and trace elements into the soil. They are very important to plants and to the microorganisms who keep the soil alive and healthy. If our plants miss minerals, when growing and bringing fruit, we miss the essential nutrients too if rely on the crops. We take the minerals from the soil with the crop, therefore we have to put them back into the soil, i. e. to remineralize it. Adding stone dust is the most natural way to remineralize the soil. Many years ago soils were created from decomposed rocks by the first hardy organisms that could survive in stone dust. These organisms gradually develop the organic matter in the soil.

Granite, a volcanic rock, has the highest mineral content. It is known that very fertile soils on the Earth are close to active volcanoes, and people settled near volcanoes despite the constant threats. Scientific research confirmed that poor soils may benefit from the ameliorating with stone dust, and in some countries (like Brazil) such remineralization became part of their agricultural policy.

According to the recommendations from the article by George Leidig “Guidance for rock dust application in compost by the Luebke method”, fine rock dust should be added at the rate of 10-20lb per cubic yard of compost to enrich the soil. It is better to add stone dust early at the composting stage but if you don't compost then add the stone dust into the soil where your fruit and vegetables grow. Stone with high content of coarse grained quartz will release silica slower, so fine grained volcanic rocks are prefereded. If the stone dust is coarse-grained you need to increase its quantity to add to the soil, and add it less frequently than fine-grained stone dust.

Currently, we can provide only large quantities of stone dust by preliminary orders.

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NOTE: This product can NOT be purchased online. If you want to buy it, please, contact us.