Grodan Delta Blocks (216 box, 384 box)

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Grodan Delta Blocks are premium-quality rockwool propagation cubes designed for fast root development, uniform growth, and excellent moisture control. Manufactured from natural bas alt rock, these blocks are pH-neutral, sterile, and provide optimal air-to-water ratios — making them ideal for both commercial growers and hobbyists. They’re widely used in hydroponic systems and greenhouse setups to propagate cuttings or young plants before transplanting into larger growing media or systems. Each block has a pre-formed hole for easy plug or seed placement. Key Benefits: Promotes strong and rapid root development Sterile, inert, and pH-neutral Excellent water retention and drainage Ideal for hydroponic or soil-based systems Pre-drilled hole for plug or seed insertion Ideal For: Hydroponics, propagation trays, greenhouses, cuttings, seedlings, and commercial growing. Show more