Humidity can fluctuate within a certain range depending on the environment. Fluctuating humidity between 70% and 90% is not going to bother the orchid at all, imo.
Water soluble hormones are best. And you're really looking for a specific group of hormones called auxins. Auxins are the major players in root development in plants. Cytokinins play more of a role in the development of shoots than they do roots. One type of auxin would be IBA. Another one is NAA.
Down potting is usually the answer to root rot.
But if the root rot is too severe, yes, keeping humidity levels high is the key to growing new roots - hopefully.
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Philip
Last edited by King_of_orchid_growing:); 06-13-2012 at 10:40 PM..
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