Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip - Wrapped (Sleeve of 6) PCO Tank and all Hydrofarm inline fans

and all Hydrofarm inline fans

Mix it well

Offering 3-speed push button operation

fewer plants lost during growing and on the retail garden center shelf and the potential for better success for home gardeners

Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield

Grodan Gro Block Improved GR10 Large 4" w/Hole 4" x 4" x 4" Strip - Wrapped (Sleeve of 6) PCO Tank and all Hydrofarm inline fansGrodan 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