Re: Dragon Fruit
I have a three-foot tall Dark Star variety that is in a pot. Had it in my backyard against the south-facing wall of the house. After a few weeks of South Florida sun, there was a noticeable yellowing of most of the stems. Just last week I moved the plant to the west-facing side of the house and it has started greening back up.
Dunno if the yellowing was necessarily "bad" though. Hopefully someone can chime in on that. But, I'd recommend you move the pots around the yard until you find a spot where they appear to be most happy.