{"product_id":"jiffy-growblock-coco-coir-block","title":"Jiffy Growblock Coco Coir Block – Propagation Cubes","description":"\u003ch2\u003eSeed, root and transplant in one block of clean, buffered coco\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eJiffy Growblock\u003c\/strong\u003e is a propagation block made from \u003cstrong\u003e100% RHP-certified coco coir\u003c\/strong\u003e, held together by a fine \u003cstrong\u003ebiodegradable PLA netting\u003c\/strong\u003e. It arrives as a flat, dry compressed plate that swells into a firm \u003cstrong\u003e50 mm or 100 mm square block\u003c\/strong\u003e when soaked, making it growing medium and container in one. The coir is washed, calcium-buffered and given a small starter charge of nutrients, so seedlings and cuttings get a stable, airy start.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir and water in balance\u003c\/strong\u003e – about \u003cstrong\u003e30% air-filled porosity\u003c\/strong\u003e with \u003cstrong\u003e63% water holding capacity\u003c\/strong\u003e, so young roots stay moist without sitting wet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffered, low-salt coir\u003c\/strong\u003e – extra washing and calcium buffering guard against early calcium deficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-pruned, fast-rooting\u003c\/strong\u003e – roots fill the block and branch rather than circling, for strong plants at transplant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLess transplant shock\u003c\/strong\u003e – the whole block goes into the next pot, slab or system with the roots undisturbed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits any watering method\u003c\/strong\u003e – overhead, ebb and flow or NFT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlant-based netting\u003c\/strong\u003e – PLA made from corn starch, compostable to \u003cstrong\u003eEN13432\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Do Young Plants Stall After Transplanting?\u003c\/h3\u003e\u003cp\u003eMost early setbacks start in the root zone: a plug that dries out or stays waterlogged, salts in poorly washed coir, or roots torn when a seedling is pulled from a tray. Unlike inert stonewool, coir buffers water and nutrients and spreads moisture evenly through the block, supporting steady \u003cstrong\u003eroot development\u003c\/strong\u003e and \u003cstrong\u003enutrient uptake\u003c\/strong\u003e, and the Growblock is planted out whole so the roots are never disturbed. Jiffy list tomatoes, peppers, cucumbers, melons, salad greens, strawberries and bedding plants among the crops it suits best.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrate:\u003c\/strong\u003e stand the blocks in a tray, ideally with drainage, and soak with lukewarm water until fully swollen\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlant:\u003c\/strong\u003e sow directly, or set in a rooted \u003cstrong\u003eJiffy-7C\u003c\/strong\u003e plug or cutting once roots show – Jiffy pair the two for the best start\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater:\u003c\/strong\u003e keep evenly moist in good light away from temperature extremes, and avoid overwatering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeed:\u003c\/strong\u003e the built-in nutrient charge is small – begin a light feed after \u003cstrong\u003e7–10 days\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransplant:\u003c\/strong\u003e when roots show at the sides, plant the Growblock intact into coco, soil, a slab or a hydroponic system\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Jiffy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Jiffy Growblock (coco coir)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlock size:\u003c\/strong\u003e 50 mm × 50 mm, or 100 mm × 100 mm (about 55 mm high when expanded, with a planting hole of about 25 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate:\u003c\/strong\u003e 100% coco coir, RHP certified, extra-washed and calcium-buffered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNetting:\u003c\/strong\u003e PLA (corn-starch based), biodegradable, compostable to EN13432\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupplied:\u003c\/strong\u003e Dry compressed plate that swells on soaking\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003epH:\u003c\/strong\u003e 5.7–6.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC:\u003c\/strong\u003e 1.1 mS\/cm (±0.3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-filled porosity:\u003c\/strong\u003e 30%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater holding capacity:\u003c\/strong\u003e 63%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal pore volume:\u003c\/strong\u003e 93%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry bulk density:\u003c\/strong\u003e 82–88 kg\/m³\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic content:\u003c\/strong\u003e Over 99%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarter nutrients:\u003c\/strong\u003e Yes – begin feeding after 7–10 days\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIrrigation:\u003c\/strong\u003e Overhead, ebb and flow, NFT\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eIs a Jiffy Growblock the same as a rockwool block?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. It is 100% coir, an organic material that holds and buffers water and nutrients like a sponge, whereas stonewool is inert and lets solution drain through. Coir also re-wets easily if a block dries out.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I put a Jiffy-7C or other plug into a Growblock?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. Jiffy say any propagation plug can be transplanted into a Growblock, and recommend Jiffy-7C coir plugs or Preforma for the best start.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDo I need to buffer or rinse the blocks first?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. The coir is already extra-washed and calcium-buffered, with a small nutrient charge added. Just soak in lukewarm water and plant once the blocks have fully expanded.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDo I remove the netting when transplanting?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eJiffy recommend planting the Growblock intact. The PLA netting is plant-based and biodegradable, so the block can go straight into the next pot, slab or system.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003ch3\u003eWorks Well With\u003c\/h3\u003e\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/jiffy-7c-coco-coir-plug\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/jiffy-7c-coco-coir-plug-1.jpg?v=1790164004\u0026amp;width=160\" alt=\"Jiffy-7C Coco Coir Propagation Plug\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eJiffy-7C Coco Coir Propagation Plug\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eJiffy's matching coir plug to root in, then step up into the block\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/jiffy-propagation-plug\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/jiffy-7-plugs-close-medium_landscape.jpg?v=1746904152\u0026amp;width=160\" alt=\"Jiffy Propagation Plug\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eJiffy Propagation Plug\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003ePeat pellets that transplant straight into a Growblock\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/large-propagator-52cm-x-37cm\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/large-propagator-52cm-x-37cm.jpg?v=1787262465\u0026amp;width=160\" alt=\"Large Propagator 52cm x 37cm\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eLarge Propagator 52cm x 37cm\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eTray and vented dome to soak and hold the blocks\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Jiffy","offers":[{"title":"2\" (50mm) – Box of 408","offer_id":53930842620170,"sku":"PRP-JIFF-002-01","price":57.9,"currency_code":"GBP","in_stock":true},{"title":"4\" (100mm) – Box of 92","offer_id":53930842652938,"sku":"PRP-JIFF-002-02","price":36.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/jiffy-growblock-coco-coir-block-50mm-box-of-408-1.jpg?v=1792275258","url":"https:\/\/hydrocropshop.co.uk\/products\/jiffy-growblock-coco-coir-block","provider":"Hydro Crop Shop","version":"1.0","type":"link"}