Wide-Format Pre-Cut Stonewool Slabs for 4" Block Integration

The Grodan® Gro-Slab Improved with pre-cut holes is the result of a research partnership between Grodan, Wageningen University & Research, and top commercial growers across North America. At 36"x8"x3" with 3 pre-cut 4"x4" holes, this wide-format slab combines a broader footprint with 4" block compatibility, eliminating manual cutting and reducing labor while maintaining optimal root zone continuity.

Key Features

• 36" x 8" x 3" wide-format slab with 3 pre-cut 4" x 4" holes — designed for seamless 4" block integration
• Wider 8" profile supports higher-density planting and improved lateral root development
• Eliminates manual hole cutting — reduces labor and improves consistency
• Advanced Wetting Agent (AWA) for optimal fiber structure and uniform WC/EC distribution
• Improved hydrophilic technology for enhanced, uniform water distribution across the full slab
• Optimized drainage and aeration balance for superior root zone management
• Maintains structure, firmness, and rigidity throughout the growing cycle
• Reusable and recyclable — part of Grodan’s sustainable growing program

What’s Included

White/Rockwool wrapped slabs with 3 pre-cut 4"x4" holes. Intended for commercial greenhouse and indoor farm use.