{"product_id":"grodan-40mm-rockwool-cubes-australia","title":"Grodan 40mm Rockwool Cubes, Pack of 6. Hydroponic Propagation Starter Plugs Australia","description":"\u003ch2\u003eThe Commercial-Standard 40mm Rockwool Cube for Hydroponic Seed Germination and Cloning\u003c\/h2\u003e\n\u003cp\u003eGrodan is the benchmark for stone wool propagation media in professional horticulture. The \u003cstrong\u003e40mm x 40mm cube\u003c\/strong\u003e is the most widely used starter plug format in commercial hydroponics and indoor grow rooms globally — sized to balance moisture retention, root expansion space, and oxygen availability at the critical early stage of plant development.\u003c\/p\u003e\n\u003cp\u003eSterile, inert, and pH stable once conditioned, Grodan rockwool cubes give seeds and cuttings a contamination-free environment where root initiation happens faster and more uniformly than in organic or loose media alternatives.\u003c\/p\u003e\n\u003ch3\u003eWhy Grodan Rockwool Outperforms Other Propagation Media\u003c\/h3\u003e\n\u003cul\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 the anaerobic conditions that cause damping-off and cutting failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSterile Growing Medium.\u003c\/strong\u003e Manufactured from inert mineral fibre with no organic matter to harbour pathogens, fungal spores, or competing biology. Reduces contamination risk significantly in clean propagation environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Moisture Retention.\u003c\/strong\u003e Holds water evenly throughout the cube without oversaturation, providing steady hydration to developing roots without the wet-dry cycling that stresses cuttings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniform Fibre Structure.\u003c\/strong\u003e Encourages even root distribution through the cube rather than circling or matting, producing a root ball that transplants cleanly into larger hydroponic systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH Stable Once Conditioned.\u003c\/strong\u003e Pre-soak in pH 5.5-5.8 solution before use to bring the cube into the optimal range for hydroponic nutrient uptake.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial Grower Standard.\u003c\/strong\u003e Used in greenhouse and hydroponic production systems worldwide. The 40mm format is the industry default for seedling and clone propagation before transplanting to larger slabs or systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 40mm x 40mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rockwool (mineral stone fibre)\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\n\u003ch3\u003eHow to Use Grodan 40mm Cubes\u003c\/h3\u003e\n\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. For enhanced root development, add \u003ca href=\"\/products\/dutch-fest-root-mass-enhancer-hydroponic-root-booster\"\u003eDutch Fest Root Mass Enhancer\u003c\/a\u003e to your pre-soak solution at the recommended rate. Do not squeeze — allow to drain naturally to maintain fibre structure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeds:\u003c\/strong\u003e Place one seed per cube at 5-10mm depth. Maintain 22-26°C and high humidity until germination.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCuttings:\u003c\/strong\u003e Apply \u003ca href=\"\/products\/clonex-rooting-gel-purple-australia\"\u003eClonex Rooting Gel\u003c\/a\u003e to the cut stem before inserting into the cube. Keep under high humidity until roots are visible at the cube base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransplanting:\u003c\/strong\u003e Move to the next system when roots emerge from the base of the cube. Do not remove the cube — transplant it directly into the larger medium or system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Bought Together\u003c\/h3\u003e\n\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 Grodan cubes. IBA gel plus rockwool is the most reliable propagation combination for hydroponic cloning.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/dutch-fest-root-mass-enhancer-hydroponic-root-booster\"\u003eDutch Fest Root Mass Enhancer\u003c\/a\u003e. Add to your pre-soak solution to prime cubes with root-stimulating biology before cuttings are inserted.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/homebox-ambient-r80s-grow-tent\"\u003eHOMEbox R80S Propagation Tent\u003c\/a\u003e. Dedicated 80x60x70cm propagation environment for full climate control over temperature and humidity during germination and cloning.\u003cbr\u003e\u003cbr\u003eProduct Details\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Stone Wool Propagation Cube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 40mm x 40mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Seed germination, cutting propagation, hydroponic cloning\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":43210161291327,"sku":null,"price":9.95,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/6898\/8479\/files\/Grodan-40-401000x1000_Grey-copy-17-600x600.png?v=1777788839","url":"https:\/\/apexgrow.com.au\/products\/grodan-40mm-rockwool-cubes-australia","provider":"Apex Grow","version":"1.0","type":"link"}