Grodan Gro-Block Improved GR10 Large with Hole, Unwrapped, 4" x 4" x 4" - Case of 144 Miticides The composition of these lights

The composition of these lights result in a far more efficient operation

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For use in container gardens or soilless hydroponic applications

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Grodan Gro-Block Improved GR10 Large with Hole, Unwrapped, 4" x 4" x 4" - Case of 144 Miticides The composition of these lightsNew and improved stone wool substrate with advanced wetting technology from Grodan Introducing Grodan Gro Blocks Improved, a product specifically engineered to deliver real results for your crops, developed by plant scientists, researchers, and top growers. A core component of the "Precision Growing" philosophy, Grodan Gro Blocks Improved with Advanced Wetting Technology allow you to cultivate more uniform and high quality crops while using less water