Should I cut orchid stems after all the flowers have dropped off?
Orchid type: Phalaenopsis
Certified GKH Gardening Expert
No, you will not need to trim these. They will flower again from the same stem. Trimming these will only force it to have to grow new stems before it flowers. Leaving them will reward you with another set of flowers as long as it receives at least 12 hours of pure darkness per day. This will be the cause of flowering.
This article will give you more information on the care of these: