How cold do you think your cactus got over last winter?
Last fall I wanted to propagate some 'San Pedro' cactus. They were fairly thick, and I wanted them to callus well, so I hung them inside a south-facing garage window using 3/8" white cotton rope. I used an overhand knot near the bottom to secure them, and added a couple of half-hitches above, with the last one near the top so that they'd hang vertically. I took the cuttings around September/October, and more-or-less forgot about them until spring, when I noticed root initials at the bases of the cuttings. I transferred them to my rooting mix (half potting soil, half perlite) and they rooted quickly.
