Grodan – Rockwool Cubes

Grodan Rockwool Cubes provide a premium, reliable growing medium trusted by growers worldwide for propagation, transplanting, and full-cycle hydroponic production. Manufactured using Grodan’s advanced stone wool technology, these cubes offer outstanding water retention, rapid drainage, and an ideal air-to-water ratio—creating the perfect environment for vigorous root development.

Each cube is clean, inert, and uniform in structure, ensuring consistent performance across every plant. Whether you’re starting cuttings, raising seedlings, or preparing plants for slabs and larger blocks, Grodan cubes deliver consistent moisture distribution and strong, healthy roots.

Available Sizes & Hole Options:

• 3″ Rockwool Cube – Small Hole (for 25mm plugs)

• 3″ Rockwool Cube – Large Hole (for 36mm plugs)

• 4″ Rockwool Cube – Small Hole (for 25mm plugs)

• 4″ Rockwool Cube – Large Hole (for 36mm plugs)

• 6″ Hugo Block (large root zone for bigger plants)

Key Benefits:

• High-quality Grodan stone wool medium

• Excellent water retention and fast drainage

• Clean, inert, and pathogen-free

• Promotes strong and uniform root development

• Ideal for hydroponics, drip systems, and flood & drain

• Multiple sizes and hole options for perfect plug fit