Cane size. I have flowered one example at about 8 inches, and the other is usally a bit over 14 inch. Cane thickness is more important and a guide to the strength of the plant I think. Mine don't flower with 1 cm thick canes, but say 15mmm is O K
But the big old plants with multiple spikes and hundrds of flowers in South Africa, were perhaps 60 cm, 2 ft or so high, and had canes maybe 2 cm thick - more like broom handles ! This can be achieved outside their home country. I used to visit a UK orchid nursery where they were almost as big, growing in a big bucket, and when I asked about culture I was told that it was in rockwool. I have never managed to keep any orchid alive in rockwool for any length of time, so I did not try and copy. But. Do grow them in S/H for in the African river valleys they are found near to the water in places which often get flooded I think. I once went looking for them in The Gambia when on holiday there, but was told they are to be found some way up the river, too far for me go in the time etc. available.
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