Background: I have a Nepenthes Bloody Mary and its mature leaves have started turning purple(ish) red. This first started late summer and I thought it might be sun burn and then attempted to adjust accordingly. It hasn't seemed to make any difference.
Since then fall has begun where I live with outdoor daily highs around 50F or 10C. We haven't turned on the heat yet, so the apartment its around 70F or 21C.
Question: Is this just the start of winter dormancy or is something wrong? If something is wrong, what might it be and how could I fix it? Finally, should I move them to my cellar for winter (much cooler with only indirect light from a small garden window in the morning)?
Thanks for any help!