Grodan Gro-Block Improved GR6.5 Small 4'' (4''x4''x2.6'') | Case of 216 unwrapped Biosafe Systems Cards and wrappers are what

Cards and wrappers are what a retail pack pays for

Dimming and Daisy-Chain: 10 brightness levels with sunrise/sunset

This 8 ft (2

making it ideal for early growth stages

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Grodan Gro-Block Improved GR6.5 Small 4'' (4''x4''x2.6'') | Case of 216 unwrapped Biosafe Systems Cards and wrappers are whatGrodan 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