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copper sulfate
Maxillaria
Did you remember Plastic Saucers and Fresh Mix
the mix will not break down and orchids that resent repotting can be left in their mix longer
Many times if you get a Dendrobium from Hawaii you will notice that it has been potted in either black or red volcanic rock
Sponge Rock (Perlite) Watering copper sulfateSponge 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. Sponge rock is the perfect size for a wide range of mixes and is a component in our general purpose orchid potting mix. Measures around 1 2 inch.
