Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" (Case of 144) botanicare Both include a 1 year

Both include a 1 year warranty

Versatile Use: Ideal for a variety of plant materials

Built with a durable polycarbonate frame

and help to sustain healthy beneficial microorganism populations in the soil

Bloom: 14 ml/gallon

Grodan Gro-Block Improved GR10 Large with Hole, 4" x 4" x 4" (Case of 144) botanicare Both include a 1 yearGrodan Gro Block Improved GR10 Large with Hole, 4" x 4" x 4" Case of 144 New 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. The uniform distribution of water and nutrients throughout the block allows for more efficient use of the entire substrate