What is your experience for Paphios culture on inert media? Rick has very good success with gravel stones. A friend of my club cultivated Paphios hybrids very well in Seramis (for info about this material click Here) and members of this forum also have very good results with Hydroton. It seems to me that it is a good method to minimize the loss of nutritive elements by reaction with classical organic substrates. Can we consider that all distributed nutritives elements are only used by the plant when they are cultivate on inert substrate? And finally why their usage is not more spread? Some sections of the Paphiopedilums family would they fit more easily than others on inert substrates?