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metabolize inside the plants into phosphorus acid
Grodan Gro-Block Improved GR22 Jumbo with Hole, 6" x 6" x 4" - Case of 64 Select Rockwool Type:GR32 Hugo w/ Hole 6"x6"x6" - Case of 64 Minimum height: 1New 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
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