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Made from natural rocks. What is Grodan stonewool? Made from natural rocks block into mineral fibers, Grodan stonewool (generically known as rockwool) has become the preferred choice for soil-less growing worldwide. Using our exclusive Delta Technology to improve fiber structure and layering, we create perfectly uniform products that are both inert and compliant to the highest environmental & quality standards. This provides a clean growing medium for growing spectacular vegetables, fruits, and vibrant flowers. |