Fibrgro horticultural grade rock wool is the best substrate choice. Rock wool gives the professional grower more control over plant performance than all other growing media.

Fibrgro horticultural grade rock wool's consistent physical properties such as porosity, density, and fiber structure, provide the best control of conductivity, pH, aeration and water content. Rock wool, unlike organic growing media such as saw dust and coconut coir, is pure, inert and pest-free.

Control through consistent physical properties is why leading professional growers around the world choose Fibrgro horticultural grade rock wool to grow the best quality plants.