Grodan Gro-Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" (Case of 64) lamps extending the root system's reach

extending the root system's reach and improving access to water and nutrients — particularly phosphorus

25" deep media holes are optimally sized for starting herbs

Mix 1/2–2 tsp

the plant can focus its energy on flowering and essential oil production instead of on producing food

OASIS® AeroSelect™ PlugSheet engineered foam substrate is ideal for hydroponic propagation and production of lettuces

Grodan Gro-Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" (Case of 64) lamps extending the root system's reachGrodan Gro Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" Case of 64 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