{"product_id":"redrock-4-inch-rockwool-cubes-4x4-propagation-starter-blocks-with-42-40-hole-6-pack-hydroponics-indoor-growing-twin-canaries-chart","title":"Redrock 4 inch Rockwool Cubes – 4x4 Propagation Starter Blocks with 42\/40 Hole | 6-Pack | Hydroponics \u0026 Indoor Growing | Twin Canaries Chart","description":"\u003ch2\u003ePropagate with confidence using Redrock 4x4 Rockwool Cubes\u003c\/h2\u003e\n\u003cp\u003eRedrock 4 inch Rockwool Cubes are 4\" x 4\" propagation blocks engineered for the earliest stages of growth in hydroponic or indoor systems. Crafted from inert, U.S.-sourced stone wool, these cubes provide a soil-free medium that supports stable moisture levels and healthy air circulation around developing roots. The result is a dependable starting point for a wide range of crops, from leafy greens to herbs and early-fruiting varieties.\u003c\/p\u003e\n\n\u003ch3\u003eKey benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePre-formed 42\/40 planting hole for clean, easy transplanting\u003c\/li\u003e\n\u003cli\u003eInert stone wool composition creates a sterile, soil-free environment\u003c\/li\u003e\n\u003cli\u003eEfficient moisture retention with controlled dry-back and air exchange\u003c\/li\u003e\n\u003cli\u003eBroad compatibility with ebb \u0026amp; flow, drip irrigation, and other hydroponic systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct details\u003c\/h3\u003e\n\u003cp\u003eThe 6-pack ships ready to use and pairs with the Twin Canaries Liquid Volume Conversion Chart for quick reference during propagation planning. This included guide helps align measurements with common growing routines, making it easier to map out your setup.\u003c\/p\u003e\n\n\u003ch3\u003eUsage and setup tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInsert starter plugs or cuttings into the 42\/40 hole with steady, careful pressure\u003c\/li\u003e\n\u003cli\u003eMaintain consistent moisture without waterlogging; consider a humidity dome for young seedlings\u003c\/li\u003e\n\u003cli\u003eTransplant once roots emerge and the plant shows steady new growth\u003c\/li\u003e\n\u003cli\u003eEnsure adequate airflow around cubes to prevent overly damp conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eReal-world scenarios\u003c\/h3\u003e\n\u003cp\u003eIdeal for leafy greens, herbs, and early fruiting crops, these cubes support a clean propagation workflow in both home grow tents and commercial rooms. They pair well with standard trays and irrigation setups for scalable propagation runs.\u003c\/p\u003e\n\n\u003ch3\u003eMaterial and handling\u003c\/h3\u003e\n\u003cp\u003eEach cube has a firm, yet forgiving texture that stays consistent through the propagation cycle. Use clean gloves and replace cubes between cycles to preserve sterile conditions and uniform results.\u003c\/p\u003e\n\n\u003ch3\u003eCare and storage\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eStore in a cool, dry area away from direct sun\u003c\/li\u003e\n\u003cli\u003eAvoid crushing the blocks to maintain hole integrity\u003c\/li\u003e\n\u003cli\u003eRinse and pre-wet before initial use to kick-start moisture balance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is included with the Redrock 4 inch Rockwool Cubes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Includes 6 cubes, 42\/40 planting hole, and the Twin Canaries chart for reference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What growing setups work with these rockwool cubes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for hydroponics and indoor growing, compatible with ebb and flow, drip irrigation, and other systems.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Twin Canaries Liquid Volume Conversion Chart","offers":[{"title":"Default Title","offer_id":45740881969338,"sku":"B0949TQN76","price":63.21,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/3536\/8890\/files\/redrock-rockwool-cubes-top-view-42-40-hole.jpg?v=1774799629","url":"https:\/\/gardencanada.ca\/products\/redrock-4-inch-rockwool-cubes-4x4-propagation-starter-blocks-with-42-40-hole-6-pack-hydroponics-indoor-growing-twin-canaries-chart","provider":"Garden Canada","version":"1.0","type":"link"}