SENIOR LADY: PENCIL CACTUS PROJECT!

I fell in love with the pencil cactus several years ago. I was shopping at a garden center. I saw a large red pot with a plant that looked like green sticks. The pot had a tag on it, which read, fire stick cactus. The sales clerk said the the sticks turn orange during the fall season. Sure enough, the cactus turned a beautiful shade of orange. I placed the cactus in my greenhouse during the winter. It stayed alive until the winter temp dropped below 20. My greenhouse was heated; however, fifty percent of the cactus died. Now, I keep my pencil cactus in my house during the winter months. I had two planters with pencil cactus that are two feet and four feet. I gave the four feet pencil cactus to my son. I am keeping the two feet cactus plant for myself. My cactus project involves separating m...