{"product_id":"grodan-75mm-rockwool-cubes-no-hole-australia","title":"Grodan 75mm Rockwool Cubes No Hole, Pack of 6. Large Hydroponic Propagation Blocks Australia","description":"\u003ch2\u003eThe Large-Format Rockwool Block for Advanced Propagation, Cloning and Transplant-Ready Root Systems\u003c\/h2\u003e\u003cp\u003eWhen cuttings outgrow a 40mm starter cube or you need more root zone volume from the start, the \u003cstrong\u003eGrodan 75mm x 75mm No Hole Rockwool Cube\u003c\/strong\u003e is the commercial-standard step up. A larger root zone, the same sterile stone wool structure, and a no-hole design that gives you full control over cutting placement, seed depth, and plug insertion.\u003c\/p\u003e\u003cp\u003eUsed in professional greenhouse and hydroponic production worldwide, the 75mm cube is the transplant-ready format — the final propagation stage before plants move into their main growing system.\u003c\/p\u003e\u003ch3\u003eWhy the 75mm No Hole Format Outperforms Smaller Cubes at This Stage\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpanded Root Zone Volume.\u003c\/strong\u003e Nearly four times the root space of a 40mm cube. Supports larger cuttings, longer propagation cycles, and plants that need more establishment time before transplanting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Pre-Drilled Hole Design.\u003c\/strong\u003e Customise insertion point, depth, and angle for large cuttings, multi-stem propagation, or transplanting rooted 40mm plugs directly into the 75mm block.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Air-to-Water Ratio.\u003c\/strong\u003e Stone wool fibre structure maintains oxygen availability at the root zone even when fully saturated, preventing anaerobic conditions and root rot during extended propagation periods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSterile Stone Wool Medium.\u003c\/strong\u003e Inert mineral fibre with no organic matter to harbour pathogens or competing biology. Consistent contamination control across a full propagation tray.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Water Retention and Drainage Balance.\u003c\/strong\u003e Holds moisture evenly without waterlogging, providing stable hydration to developing roots through the full vegetative establishment phase.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniform Fibre Structure.\u003c\/strong\u003e Encourages aggressive, even root expansion through the block, producing a dense root ball that transplants cleanly into slabs, pots, or recirculating systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 75mm x 75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rockwool (mineral stone fibre)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e No pre-drilled hole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStructure:\u003c\/strong\u003e High-porosity fibre matrix\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSterility:\u003c\/strong\u003e Sterile growing medium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Retention:\u003c\/strong\u003e High, with drainage balance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAeration:\u003c\/strong\u003e High oxygen root zone\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Netherlands (Grodan manufacturing)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow to Use Grodan 75mm No Hole Cubes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-soak\u003c\/strong\u003e cubes in pH 5.5-5.8 water for 30-60 minutes before use. Add \u003ca href=\"\/products\/nefarious-rhizo-tonic-root-stimulator\"\u003eNefarious Rhizo Tonic\u003c\/a\u003e 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCuttings:\u003c\/strong\u003e Use a clean blade or skewer to create your insertion point at the desired depth and angle. Apply \u003ca href=\"\/products\/clonex-rooting-gel-purple-australia\"\u003eClonex Rooting Gel\u003c\/a\u003e to the cut stem before inserting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransplanting from 40mm cubes:\u003c\/strong\u003e Cut or press a recess into the 75mm block to accept the rooted 40mm cube directly. Roots will grow through into the larger block within days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransplanting to main system:\u003c\/strong\u003e Move when roots are visible at the base and sides of the block. Transplant the cube directly — do not remove it from the root ball.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eGrodan Rockwool Propagation Range\u003c\/h3\u003e\u003cp\u003eStructure your propagation system across the full Grodan cube range for maximum efficiency.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/grodan-40mm-rockwool-cubes-australia\"\u003eGrodan 40mm Rockwool Cubes\u003c\/a\u003e — seed germination and early clone rooting stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrodan 75mm No Hole Cubes\u003c\/strong\u003e — advanced propagation, large cuttings, and transplant-ready root development\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Bought Together\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/clonex-rooting-gel-purple-australia\"\u003eClonex Rooting Hormone Gel\u003c\/a\u003e. Apply to cuttings before inserting into the 75mm block for faster, more reliable root initiation.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/nefarious-rhizo-tonic-root-stimulator\"\u003eNefarious Rhizo Tonic\u003c\/a\u003e. Add to your pre-soak solution to prime cubes with root-stimulating compounds before use.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/jbs-propagation-lid-hydroponic-cloning-dome-australia\"\u003eJB's Propagation Lid\u003c\/a\u003e. Self-dripping humidity dome that maintains the high-humidity environment large cuttings need during the rooting period.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/homebox-ambient-r80s-grow-tent\"\u003eHOMEbox R80S Propagation Tent\u003c\/a\u003e. Dedicated propagation environment for full climate control over temperature and humidity during cloning and establishment.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/x-stream-aeroponic-propagator-cloning-machine-australia\"\u003eX-Stream Aeroponic Cloner\u003c\/a\u003e. For growers running aeroponic propagation systems alongside rockwool-based setups.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProduct Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Large-Format Stone Wool Propagation Block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 75mm x 75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e No pre-drilled hole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Advanced cloning, vegetative growth, transplanting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Systems:\u003c\/strong\u003e Hydroponics, DWC, coco, greenhouse production\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-Treatment:\u003c\/strong\u003e Pre-soak at pH 5.5-5.8 before use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVendor:\u003c\/strong\u003e Grodan\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Grodan","offers":[{"title":"Default Title","offer_id":43210162208831,"sku":null,"price":14.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/6898\/8479\/files\/GRODAN-75MM-no-holes_1000x1000_Grey-copy-11-600x600_1.png?v=1777789483","url":"https:\/\/apexgrow.com.au\/products\/grodan-75mm-rockwool-cubes-no-hole-australia","provider":"Apex Grow","version":"1.0","type":"link"}