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These are 50 cubes of rockwool, a soilless growing medium for germinating seeds and rooting cuttings. Each plug measures about 4.72 by 4.72 by 1.18 inches, so they are large blocks rather than the small starter cubes most hydroponic kits use. Rockwool holds water and air well, which is why it is a standard medium for seed starting and cloning. The trade-offs are the same as with any rockwool: it must be pH-conditioned before use, it sheds fibers, and it is not reusable.
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These rockwool starter plugs are a soilless growing substrate for sowing seeds and raising saplings. Each pack contains 50 plugs. The material is rock wool.
The plugs absorb water quickly and supply water and nutrients to the seed. They are breathable, which supports respiration and growth and helps resist seed decay and mold. The substrate contains no harmful substances.
To use, place the seed in a plug, then set the plug in a growing tray or flower pot to sow and raise saplings.
