Why would my plant turn brown at the joints and break off? I live in Alabama and it is planted outside in full sun.
Certified GKH Gardening Expert
It is very likely that a cold snap will do this. They are only hardy down to 30 degrees, and below that will die off completely. Anything below 50, and the growth will slow down. Here is an article that will help: https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm