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...Vermiculite - Perlite - Pouzzolane...
Was the fertiliser used the same?
But he has a fantastic source of loose pine duff surface soil from the local woods (not available to most of us)
For me they are the easiest of the hardy orchids.
''For Cypripedium seedlings we use the top 10cm layer of a soil derived from mixed coniferous and deciduous woodland. The soil is naturally well draining and we always use clay pots. This combination provides good drainage and good close contact between the roots and the soil.''