Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip - Unwrapped (Case of 144 Blocks) substrate bag and 60/50Hz

and 60/50Hz

these make a very clean and effective tea that functions as a living topsoil

Use with core & coil ballasts for optimal performance

Fine saddle tension adjustments for tight trimming

Silicon is an important but often overlooked component to plant health and growth

Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip - Unwrapped (Case of 144 Blocks) substrate bag and 60/50HzGrodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan Gro Blocks Improved with Grodans Advanced Wetting Agent. These leading edge blocks have the optimal fiber structure and physical properties for crop uniformity, more