Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Garden Care & Stick: Add 1/4 cup

& Stick: Add 1/4 cup per gal water

including many beneficial insects

The open top allows you to easily see your work and also fill it without having to remove the top

4"L x 2735"W x 4

80 µmol/joule

Grodan Gro-Block Improved GR5.6 Large with Hole, 3" x 3" x 4" - Case of 256 Garden Care & Stick: Add 1/4 cupNew 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