Yellow Banana Peppers
Why do the Capsicum (yellow banana variety) stems go purple? Is it normal? The flowers are dropping off; is it due to that?
Certified GKH Gardening Expert
Purple stems on a pepper plant are normal in most cases, but in some cases it can be a phosphorous deficiency. Just to be on the safe side, I would add a little bone meal to the soil to add phosphorous, but likely this is a normal reaction.
This article will help you with why the flowers might be falling off: