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GERsome sells a pack of 50 stonewool starter cubes for hydroponics, cloning and seed germination. Each cube has a planting hole and holds water while staying airy, so cuttings and seedlings can root before moving to net pots or a system. The cubes arrive with a high pH, so they need soaking and pH adjustment before use. They are a basic consumable rather than a reusable tool, and rival plugs compete mainly on pre-conditioned pH and cube size.
In stockSold by MorepickReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Availability unknown
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Lowest price we've seen: $4.59 on Nov 15 at Amazon. Tracked across 1 store since Nov 15.
This set includes 50 rockwool (stonewool) cubes for starting plants without soil. They suit hydroponics, seed starting, rooting cuttings, cloning and plant propagation.
The cubes are made from rock that is melted at high temperature and spun into fibers, then compressed into blocks. The texture is soft and uniform, with low density and high porosity. The material is sterile, absorbs water well, breathes well and drains well.
New blocks have a pH of about 7-8. Before use, soak them in water adjusted to a pH of 5.5-6, or add a little lemon to lower the pH. Soak for 2 minutes, lift out and let stand for about 15 minutes. Then place the seeds or cuttings in the planting holes and spray with water. Wear gloves when handling them.
