Bulbophyllum rothschildianum occurs in the Southern Yunanan Province of China, Northeastern India and Assam. I have this growing under 75% shade cloth growing in a shallow pan in medium bark topped with a layer of sphagnum moss. I let it just dry out between waterings and this particular species flowers between Spring and Autumn. It is available to temperatures between 0°C - 40°C.
This plant puts on an incredible display when grown into a large specimen plant.