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These are stonewool (rock wool) starter cubes for hydroponic and soilless growing. Molten rock is spun into fibers and compressed into blocks that hold air and water well, and the high-temperature treatment leaves them clean and sterile for seedlings and cuttings. They are a basic, low-cost propagation medium like Grodan or generic rock wool plugs, with no nutrients or binders added. Best suited to hobby hydroponic growers starting seeds or rooting clones.
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Lowest price we've seen: $6.49 on Nov 15 at Amazon. Tracked across 1 store since Nov 15.
These stone wool cubes are a soilless growing medium for hydroponics. They are made from molten rock that is spun into fine fibers and then compressed into cubes. High-temperature treatment leaves them sterile.
The cubes have a light texture, low bulk density and large porosity. They let air through, absorb water well and drain well. They can be used to grow and establish all types of plants in soilless cultivation.
