Can I bring a containerized plumbago indoors in the winter?
You should let it go dormant and not try to keep it as a houseplant. If your concern is cold winter survival in a pot outdoors, you have several options. 1. Dig a hole in the ground to hold the pot; 2 heap soil over the pot by putting it into a larger pot; 3. use a large pillowcase or sheet (not plastic) to encase the pot in chopped leaves and 4. get a straw bale and cut a hole for the pot. The idea is to use straw, dirt or leaves as insulation. Plumbago is very hardy. Unless you are in the Yukon, I think any of these techniques will work.