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If the orchid mix pH is too high
no surprises
It also helps protect them against fungus gnats
Small Sponge Rock - Perlite
MSU orchid fertilizer for RO/Rain/Tap is urea free
Large Sponge Rock Size:Mini Bag If the orchid mix pHSponge 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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