Research-Backed Stonewool Blocks for Precision Propagation & Early-Stage Cultivation

The Grodan® Gro-Block Improved GR4 Small (No Hole) is the result of a research partnership between Grodan, Wageningen University & Research, and top commercial growers across North America. This compact 3"x3"x2.6" block without a pre-cut hole is ideal for growers who prefer to make their own planting hole or use it for specific propagation techniques.

Key Features

• 3" x 3" x 2.6" small format block — no pre-cut hole — GR4 grade
• Strip packaging — commercial bulk format without retail wrapping
• Advanced Wetting Agent (AWA) for optimal fiber structure and uniform WC/EC distribution
• Improved hydrophilic technology for enhanced water distribution over the full block height
• Optimized wool structure for faster rooting-in and nutrient solution replenishment
• Maintains structure, firmness, and rigidity throughout the growing process
• Reusable and recyclable — part of Grodan’s sustainable growing program

What’s Included

Strip-packaged blocks, commercial bulk format. Intended for commercial use.