Grodan 2" x 2 inch 50 Sheet Rockwool Stonewool A-OK Starter Plugs Growing Media These starter plugs are a great way to start a new seedling or to pot up a cutting or seedling into a new growing media. The starter plugs are made of 50 sheets of compressed rockwool, which is a natural material made from melted basalt rock. Rockwool has been used in the horticulture industry for over 40 years. These starter plugs are an excellent alternative to planting seeds in a plastic pot, as they provide better root aeration and a more natural growing environment.
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