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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 retains moisture. Sponge rock is a volcanic glass that expands when heated and becomes very porous. Medium sponge rock, #3, is the perfect size for a wide range of mixes and is a component in our general purpose orchid potting mix.
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🇺🇸 Ship from USA · On Agora since 2024
$17.95