Hi All, perhaps someone out there could throw some light on this matter? I get excellent root development on terrestrial orchids if the plants are initially on a clear medium, (1/2 MS) and then replated onto the same medium but containing charcoal. However, with the follow up replate, (charcoal added to the medium), the plants lose colour, (pH drops and leaves turn white, ) probably because the charcoal has adsorbed some critical nutrients. I had hoped that adding IBA to the clear medium would stimulate root development to such an extent that it would be unnecessary to incorporate any charcoal. IBA (indol-butyric acid) is a powerful rooting hormone generally used in tissue culture practices, - would anyone have any any knowledge as to whether it would perhaps inhibit rooting of terrestiral orchids if the concentration levels in the medium were incorrect? Adding banana to the medium is great, but root development is still poor. regards Hildegard
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