I’ve finally sussed this orchid, and it’s responded with a mass flowering, just coming on now with faintly hyacinth-scented blooms.
It’s got an unusual growth habit and wanes slowly if it’s not maintained. The new stems shoot from the base in Spring, grow with handsome leaves for 18 months, then drop their leaves and are bare, but succulent, through their second Winter. They need a slight chill, then in late Winter the bare stems send out flower spikes. The secret to them seems to be that they need to be buried in bark mix in order to send up a good crop of shoots. So every couple of years you need to re-pot and set the old shoots quite low. Use a tall pot.
