Grodan Gro-Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" (Case of 64) lamps the plant can focus its

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

25" deep media holes are optimally sized for starting herbs

the sturdy sealing arm is mounted on a thick

black powder-coated frames made from 25mm tempered rolled steel

The spring-loaded antidraft damper is built for heavy-duty performance in applications like overhead range hoods in kitchens

Grodan Gro-Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" (Case of 64) lamps the plant can focus itsGrodan 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