Yes the charcoal prevents sourness of the media but I haven't had Sphagnum go sour before. If you repot each year which you reallu have to with Masdevallias then charcoal won't impact on the plants from what I've seen. I tried it and didn't notice any real difference in the media or the plant growth.
Last edited by Bolero; 10-20-2009 at 11:39 PM..
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