Description
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 retains 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.
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