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Hermodactylus tuberosus here yesterday.
I can't help with tubers(?)/bulbs of the Hermodactylus Anthony but if you have joined NZAGS, several people in Chch grow it well. I'm thinking particularly of Peg Tocher who has or had a lovely flowering patch a while back when I was there. Maybe a small ad in the NZAGS newsletter would produce a result. I can't flower the darned thing.