All my frost tender potted cacti are resting on my patio, just waiting for the danger of frost to pass. In my little micro climate, temperatures have to fallen to below 39° F. to date, and if we are lucky, we'll get to March without any lower temperatures. Many of these cacti do not like temperatures below 40° F. The most vulnerable are placed closest to the house.
I do not water many of these from late November until mid-February, depending on the genus and species. Watering in the winter months can cause root rot. During our mild winters, cacti will shrink by one-third or more while dormant, others turn a purplish hue, and still others look their best during the winter months.
After all danger of frost has passed, usually in late February, I will move all these pots from under their patio protection out into the open where they will have a northeastern exposure. They will begin soaking up the sunlight and start flower production. I will give all the potted cacti a liquid cactus fertilizer mixed with water when I resume their watering schedule. The fertilizer will be given monthly during their growing and flowering phase.