Q.Pencil catus
I have a pencil cactus growing outside, it is 6 ft. Tall. The pencil cactus was subject to freezing temperatures 20/28 degrees here in Polk county fl. The trunk of the pencil cactus is still green but the cactus branches turned orange than brown. What should I do to help my pencil cactus? Thank you for time , ann

Unfortunately, they do not tolerate temps. this low. They will recover as long as you can keep them covered with burlap during these low temperatures. The only thing that you can do now is wait and keep them from the cold. Here is an article on their care: https://www.gardeningknowhow.com/ornamental/cacti-succulents/pencil-cactus/care-pencil-cactus.htm