How to Prune pink rock orchid?
No pruning required. Remove spent flowers as necessary.

pink rock orchid · Dendrobium kingianum
Grow in an open medium with plenty of light, fresh air and good humidity. In spring and summer, water when compost starts to dry out. In winter, reduce watering and allow a 4 week period of daytime temperature around 8°C to encourage flowering. Feed regularly when in growth. See Orchids: indoor cultivation for further information
No pruning required. Remove spent flowers as necessary.