Derrick Posted January 11, 2015 Report Share Posted January 11, 2015 I see on the WWW there is at least one hydnophytum grower that uses some karst rock as a coarse gravel in his potting mix. "50% orchids mix, 25% sphagnum moss, 25% white karst rock, some crush (sic) egg shells for the calcium and some scoops of worm humus." http://en.wikipedia.org/wiki/Karst http://en.wikipedia.org/wiki/Gypsum A carbonate based rock is not one I would have considered for epiphytic plants but perhaps one composed of gypsum (pH neutral) might work. Further to this, I wonder if myrmecodomic plants respond differently to most other epiphytes. Certainly some myrmecodomic orchids also occur on limestone cliffs. Link to comment Share on other sites More sharing options...
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