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 soil type and are a natural volcanic rock. These smaller stones retain the most water between the stones. Therefore, they dry out the slowest. The 1 - 2 mm pumice granules are excellent as a supplement to soil mixtures, complete soil mix for small plants, or as a standalone seedling soil.
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