Grodan Gro-Block Improved GR6.5 Blocks. 4x4x2.6 (Case of 216. unwrapped. bulk)

Grodan Gro-Block Improved 4x4 for Precision Growing These stone wool blocks feature advanced wetting technology for even water content and EC throughout the entire substrate, enabling faster rooting-in and consistent plant development. The optimized fiber structure supports stronger roots that fully explore the block, improving water and nutrient uptake while reducing overall inputs. Backed by collaboration with Wageningen University & Research and leading North American growers, these 4"x4"x2.6" blocks deliver measurable gains in quality and yield. Ideal for greenhouses, indoor gardens, and vertical farms, they make crop steering more responsive and predictable across vegetative and generative phases. Unwrapped blocks allow flexible configuration and efficient saturation, with reliable re-wettability throughout the cycle (Case of 216). Stone Wool Substrate with Advanced Wetting Technology Growers gain stable EC behavior, uniform WC, and precise irrigation control—key advantages when running drip systems and dialing in daily steering targets. Use for transplanting from starter plugs, steering with tighter WC/EC bands, and driving uniform canopies in CEA environments. Key features: Uniform WC/EC across the block for precise, repeatable steering Faster rooting-in reduces veg time and accelerates crop cycles Optimized fiber structure drives robust roots and higher uptake Advanced wetting tech improves re-wettability and irrigation efficiency Proven performance in CEA: steady quality, stronger plants, better yield