Nandina

Question

It lost its leaves, and we are not in a cold area.

Answer 1

Uh oh. Has there been a dry spell? Oddly enough, if the opposite has happened- Too much water_ then this can cause leaf drop as well. This article will give you more information on the care of these:

https://www.gardeningknowhow.com/ornamental/shrubs/heavenly-bamboo/growing-heavenly-bamboo.htm