Sponge Rock (Perlite)

rePotme Verified independent store

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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. Sponge rock is the perfect size for a wide range of mixes and is a component in our general purpose orchid potting mix. Measures around 1/2 inch. Show more