{"product_id":"grodan-mm-40-40-mini-blocks","title":"Grodan MM 40\/40 Stone Wool Mini Blocks – 40mm, Box of 2250","description":"\u003ch2\u003eThe 40mm block that starts a seed or a cutting and drops straight into a Delta block\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eGrodan MM 40\/40\u003c\/strong\u003e is a \u003cstrong\u003e40 x 40 x 40mm stone wool mini block\u003c\/strong\u003e with a pre-formed \u003cstrong\u003e6mm x 15mm\u003c\/strong\u003e planting hole, made by ROCKWOOL in the Netherlands. Each block is \u003cstrong\u003eindividually wrapped\u003c\/strong\u003e in white film, which keeps light off the roots, limits algae and steers roots downward. It is the block Grodan designed to root a seed or cutting and then \u003cstrong\u003eblock on into a 3\", 4\" or 6\" Grodan Delta block\u003c\/strong\u003e or straight onto a slab, so the plant is never pulled out of its medium. Supplied as a \u003cstrong\u003efull carton of 2,250\u003c\/strong\u003e: 15 blocks per strip, 45 per shrink-wrapped sleeve, 50 sleeves per box.\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInert, sterile and pH-neutral\u003c\/strong\u003e stone wool spun from basalt, with uniform density and fibre structure for even water, nutrient and pH distribution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-formed 6 x 15mm hole\u003c\/strong\u003e takes a seed or a cutting stem without tearing the fibre\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividually wrapped\u003c\/strong\u003e - less algae, less light on the root zone, tidier handling in the propagator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for Delta blocks\u003c\/strong\u003e - the 40mm cube fits the large hole of a Grodan Delta, so transplanting is a drop-in with no root disturbance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuits NFT, drip, ebb-and-flood and slab culture\u003c\/strong\u003e after rooting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarton of 2,250\u003c\/strong\u003e for nurseries and growers running propagation every week\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSlow, uneven rooting and lime shock in fresh stone wool\u003c\/h3\u003e\n\u003cp\u003eStone wool comes out of manufacture carrying residual lime, so unsoaked blocks push the root zone alkaline and stall \u003cstrong\u003egermination and rooting\u003c\/strong\u003e. A short soak in \u003cstrong\u003epH 5.5-5.8\u003c\/strong\u003e water or a weak nutrient solution neutralises it. Because the medium holds no nutrient buffer of its own, \u003cstrong\u003epH and EC\u003c\/strong\u003e need watching more closely than in soil or coco, and a block that is squeezed loses the air structure that makes it work.\u003c\/p\u003e\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoak\u003c\/strong\u003e the blocks in water or a quarter-strength nutrient solution adjusted to \u003cstrong\u003epH 5.5-5.8\u003c\/strong\u003e for 15-30 minutes, then let them drain naturally - never squeeze them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSow one seed\u003c\/strong\u003e or set one cutting in the pre-formed hole and place the strip in a propagator with bottom heat and high humidity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeep the blocks moist, not saturated\u003c\/strong\u003e; aim to shed about a quarter of the water before transplanting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock on\u003c\/strong\u003e into a Delta 3\", 4\" or 6\" block, a pot of coco or straight onto a slab once roots show at the base. Remove the wrap at that point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeed at a low EC\u003c\/strong\u003e through rooting and step up as the plant establishes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Grodan MM 40\/40 6\/15 stone wool mini block\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock size:\u003c\/strong\u003e 40 x 40 x 40mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanting hole:\u003c\/strong\u003e 6mm diameter x 15mm deep\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrapping:\u003c\/strong\u003e individually film-wrapped\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack structure:\u003c\/strong\u003e 15 per strip, 45 per sleeve, 2,250 per carton (50 sleeves)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarton weight:\u003c\/strong\u003e approx. 13-15kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e inert basalt stone wool, sterile, pH-neutral once soaked\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoak pH:\u003c\/strong\u003e 5.5-5.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNext step:\u003c\/strong\u003e Grodan Delta 3\", 4\" or 6\" blocks, or slabs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e ROCKWOOL B.V., Roermond, Netherlands\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n","brand":"Grodan","offers":[{"title":"Box of 2250","offer_id":53359546827018,"sku":"MED-GROD-001-01","price":360.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/grodan-mm-40-40-mini-blocks-1.jpg?v=1788349976","url":"https:\/\/hydrocropshop.co.uk\/products\/grodan-mm-40-40-mini-blocks","provider":"Hydro Crop Shop","version":"1.0","type":"link"}