Give your seeds, seedlings, and plants even more strength and growth potential without artificial substrates or nutrients. Pumice granules (also known as pumice or pumice stones) are a good type of soil and are a natural volcanic rock. The 3 - 8 mm pumice granules are excellent as a supplement in potting soils and substrates. Or as a standalone substrate (100% pumice). Perfect for germinating seeds or growing your seedlings and plants.
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