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It also helps protect them against fungus gnats
holes or other obstructions on the sides that prevent the roots from being lifted out of the pot
no surprises
Augustine Orchid Society
Large Sponge Rock Size:Mini Bag It also helps protect themSponge 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. Large sponge rock, #4, is best combined with other large chunk media.
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