Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Garden Care After dozens of lab tests

After dozens of lab tests and real world tests

Protects your garden and keeps your plants safe

& Stick: Add 1/4 cup per gal water

Combine with a CenturionPro XL Trimmer and achieve the highest capacity harvesting system in the world

Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Garden Care After dozens of lab testsNew 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