{"product_id":"cultiwool","title":"Cultiwool Cubes","description":"```html\n\u003csection class=\"gh-product-listing\"\u003e\n\n\u003ch2\u003eCultiwool Cubes — Professional Rockwool Propagation Medium for Hydroponics\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers who need reliable seed starting and propagation cubes that actually deliver consistent results\u003c\/p\u003e\n\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003e\nCultiwool is the no-nonsense choice for propagation. It's inert, sterile, properly engineered, and does what rockwool should do without faffing about. One we recommend to growers moving away from dodgy seed trays and into proper propagation systems.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eCultiwool Cubes are \u003cstrong\u003eprofessional-grade stonewool propagation medium\u003c\/strong\u003e manufactured in Europe to exacting standards. Made from natural basalt rock, melted, spun, and compressed into uniform cubes with pre-punched holes, they deliver the air-to-water balance hydroponic propagation demands. Whether you're rooting cuttings, starting seeds, or transitioning plants into larger systems, Cultiwool gives you a sterile, pH-stable, inert foundation that actually performs. No nasties, no guesswork, no surprises.\u003c\/p\u003e\n\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eCultiwool sits in the \u003cstrong\u003epremium professional tier\u003c\/strong\u003e of propagation media.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGrodan is the market leader; Cultiwool delivers equivalent performance at a sensible price point\u003c\/li\u003e\n\u003cli\u003eMade from basalt rock (not slag), ensuring purity and consistency in every cube\u003c\/li\u003e\n\u003cli\u003eRHP certified — meets strict European horticultural standards for safety and quality\u003c\/li\u003e\n\u003cli\u003eOutperforms budget alternatives (coco, perlite, clay pebbles) in germination rates and rooting speed\u003c\/li\u003e\n\u003cli\u003eReusable in closed-loop systems, saving water and reducing waste\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is engineered propagation media, not a budget substitute. You're paying for reliability and results.\u003c\/p\u003e\n\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eCultiwool cubes work across different propagation setups:\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSeed starting\u003c\/strong\u003e\u003cbr\u003e\nSoak cubes in pH 5.5–5.8 water with an EC of at least 1.5 mS\/cm for about 30 seconds. Let them drain. Insert seeds into the pre-punched hole, keep moisture consistent, and germination rates typically run 70% or higher — well above alternatives.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCutting propagation\u003c\/strong\u003e\u003cbr\u003e\nSoak as above. Insert rooted cuttings into the hole. The donut-ring design guides water evenly across the cube, reducing dry spots and promoting uniform root development. Ready for transition in 7–14 days depending on conditions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHydroponic transition\u003c\/strong\u003e\u003cbr\u003e\nOnce roots emerge, place cubes directly into larger Cultiwool blocks or into your main hydroponic system (NFT, ebb and flow, drip). The cube integrates seamlessly without transplant shock.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAir-to-water ratio\u003c\/strong\u003e\u003cbr\u003e\nWhen hydrated, Cultiwool delivers exactly 80% water, 20% air. This ratio is engineered to balance moisture retention with oxygen availability — too much water drowns roots, too much air dries them out. Stonewool gets the ratio right.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: \u003cstrong\u003e100% natural basalt rock stonewool (RHP certified)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAir-to-water ratio: \u003cstrong\u003e20% air, 80% water when hydrated\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003epH stability: \u003cstrong\u003e5.5–6.5 (neutral, naturally buffered)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInert composition: \u003cstrong\u003eNo nutrients, no contaminants, no organic matter breakdown\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: \u003cstrong\u003e1.5\" × 1.5\" × 1.5\" (mini), 3\" (75mm), 4\" (100mm)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHole options: \u003cstrong\u003eSmall hole (25mm plugs) or large hole (36mm plugs)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePackaging: \u003cstrong\u003eSingle packs, strips, trays, or bulk cases (up to 2,250 cubes per case)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOrigin: \u003cstrong\u003eEuropean manufacture, high-density fiber construction\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eReusable: \u003cstrong\u003eCan be sterilised and re-used in closed-loop systems\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHydroponic growers needing consistent, reliable propagation performance\u003c\/li\u003e\n\u003cli\u003eCommercial or semi-commercial operations where germination rates and timing matter\u003c\/li\u003e\n\u003cli\u003eAnyone stepping up from peat pellets or foam cubes to proper stonewool\u003c\/li\u003e\n\u003cli\u003eGrowers running ebb-and-flow, NFT, drip, or flood systems at scale\u003c\/li\u003e\n\u003cli\u003eSeed companies, nurseries, or serious hobby growers maximising crop yields\u003c\/li\u003e\n\u003cli\u003eWater-conscious operations looking to recirculate nutrient solution\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eCultiwool Cubes are professional-grade propagation media that does exactly what it should. Inert, sterile, properly engineered, and proven to deliver higher germination rates and rooting success than budget alternatives. If you're serious about propagation — whether you're running five plants or five hundred — this is the foundation worth building on.\u003c\/p\u003e\n\u003cp\u003eCompetitively priced against Grodan and superior to everything else in its class. Good time to buy while clearance stock lasts.\u003c\/p\u003e\n\n\u003c\/section\u003e\n```","brand":"CULTIWOOL","offers":[{"title":"4\" Small Hole","offer_id":47916546818218,"sku":"811054","price":0.59,"currency_code":"GBP","in_stock":true},{"title":"4\" Large Hole","offer_id":47916546850986,"sku":"811055","price":0.53,"currency_code":"GBP","in_stock":false},{"title":"3\" Small Hole","offer_id":47916546883754,"sku":"811056","price":0.39,"currency_code":"GBP","in_stock":true},{"title":"3\" Large Hole","offer_id":47916546916522,"sku":"811057","price":0.39,"currency_code":"GBP","in_stock":false},{"title":"Small Cube Tray","offer_id":47916546949290,"sku":"811058","price":11.99,"currency_code":"GBP","in_stock":true},{"title":"Huge 150mm Cube Large Hole","offer_id":47916546982058,"sku":"811061","price":2.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/811057_-_3_inch_large_hole_2d01d2e2-c714-4fb1-bb62-afd43de66aad.jpg?v=1769195782","url":"https:\/\/growershouse.co.uk\/products\/cultiwool","provider":"Growers House ","version":"1.0","type":"link"}