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Cork is a natural product that is produced from the bark of the Cork Oak or quercus suber tree
no surprises
We recommend you store the granular FEED ME
MSU orchid fertilizer for RO/Rain/Tap is urea free
It also helps protect them against fungus gnats
Large Sponge Rock Size:Mini Bag Cork is a natural productSponge 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.
