Small Sponge Rock - Perlite

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Sponge rock, also known by the name Perlite, is a very common ingredient in orchid mixes and for good reason. Sponge rock decreases compaction of mix, increases aeration and retain s moisture. Sponge rock is a volcanic glass that expands when heated and becomes very porous. The small sponge rock, #2, is wonderful in seedling and peat mixes. Show more