Grodan 75mm Rockwool Cubes With Hole, pack of 6. Hydroponic Cloning Blocks Australia

The Precision Cloning Cube for Consistent, Repeatable Hydroponic Propagation

The pre-formed hole is the difference between a cube you have to modify and one that's ready to use. The Grodan 75mm x 75mm With Hole Rockwool Cube is engineered for standardised cutting placement — consistent insertion depth, consistent rooting environment, consistent results across every plant in a propagation tray.

Used in commercial greenhouse and hydroponic production where repeatability and batch success rates matter, the 75mm with-hole format is the most search-intent-matched propagation cube in the Grodan range. Growers looking for cloning plugs, starter cubes for cuttings, and hydroponic propagation blocks are searching for exactly this product.

Why the With-Hole Format Outperforms No-Hole at the Cloning Stage

• Pre-Formed Planting Hole. Consistent insertion depth and angle across every cube in the tray. Reduces handling error, speeds up the cloning process, and produces more uniform rooting outcomes in batch propagation.
• High Air-to-Water Ratio. Stone wool fibre structure maintains oxygen availability at the root zone even when fully saturated, preventing anaerobic conditions that cause cutting failure and damping-off.
• Sterile Growing Medium. Inert mineral fibre with no organic matter to harbour pathogens or competing biology. Consistent contamination control across a full propagation run.
• Excellent Water Retention with Controlled Drainage. Holds moisture evenly without waterlogging, providing stable hydration to developing roots through the full rooting period.
• Uniform Fibre Distribution. Encourages even, aggressive root expansion through the block, producing a dense root ball that transplants cleanly into slabs, pots, or recirculating systems.
• Commercial Grade Standard. Compatible with automated drip irrigation and commercial propagation systems. The format used in professional horticulture production worldwide.

Technical Specifications

• Dimensions: 75mm x 75mm
• Material: Rockwool (mineral stone fibre)
• Design: Pre-formed planting hole
• Structure: High-porosity fibre matrix
• Sterility: Sterile growing medium
• Water Retention: High, with drainage balance
• Aeration: High oxygen root zone
• Origin: Netherlands (Grodan manufacturing)

How to Use Grodan 75mm With Hole Cubes

• Pre-soak cubes in pH 5.5-5.8 water for 30-60 minutes before use. Add GT Rootzone to your pre-soak solution at the recommended rate to prime the cube with root-stimulating compounds before insertion. Do not squeeze — allow to drain naturally to maintain fibre structure.
• Cuttings: Apply Clonex Rooting Gel to the cut stem and insert directly into the pre-formed hole. No modification required.
• Seeds: Place one seed per cube at the base of the pre-formed hole at 5-10mm depth. Maintain 22-26°C and high humidity until germination.
• Transplanting: Move to the next system when roots are visible at the base and sides of the block. Transplant the cube directly — do not remove it from the root ball.

Grodan Rockwool Propagation Range

Build a complete propagation system across the full Grodan cube range.

• Grodan 40mm Rockwool Cubes — seed germination and early clone rooting stage
• Grodan 75mm No Hole Cubes — flexible advanced propagation with custom placement
• Grodan 75mm With Hole Cubes — standardised cloning and transplant-precision stage

Frequently Bought Together

• Clonex Rooting Hormone Gel. Apply to cuttings before inserting into the pre-formed hole for faster, more reliable root initiation.
• GT Rootzone. Add to your pre-soak solution to prime cubes with root-stimulating compounds before use.
• JB's Propagation Lid. Self-dripping humidity dome that maintains the high-humidity environment cuttings need during the rooting period.
• HOMEbox R80S Propagation Tent. Dedicated propagation environment for full climate control over temperature and humidity during cloning and establishment.
• X-Stream Aeroponic Cloner. For growers running aeroponic propagation systems alongside rockwool-based setups.

Product Details

• Type: Stone Wool Propagation Cube with Pre-Formed Hole
• Dimensions: 75mm x 75mm
• Design: Pre-formed planting hole
• Application: Hydroponic cloning, seed germination, transplanting
• Compatible Systems: Hydroponics, DWC, drip irrigation, greenhouse production
• Pre-Treatment: Pre-soak at pH 5.5-5.8 before use
• Vendor: Grodan