Orchid Nerd ® Sponge Rock 2 Cubic Foot Box
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.
- #3 medium size sponge rock
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