Grodan Gro-Block Improved GR10 Large with Hole, Unwrapped, 4" x 4" x 4" - Case of 144 Select Rockwool Type:Mini-Block, 1.5" - Case of 2250 Contains Amino Acids: With a

Contains Amino Acids: With a high carbon/nitrogen ratio

Bait Mixing Instructions: Pour yeast and catalyst (small plastic bag in yeast) into a gallon jug

Enjoy a cleaner

and 15 other ingredients

Grodan Gro-Block Improved GR10 Large with Hole, Unwrapped, 4" x 4" x 4" - Case of 144 Select Rockwool Type:Mini-Block, 1.5" - Case of 2250 Contains Amino Acids: With aNew 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. A core component of the "Precision Growing" philosophy, Grodan Gro Blocks Improved with Advanced Wetting Technology allow you to cultivate more uniform and high quality crops while using less water