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From the look of the plant, it is in desperate need of water. Some plants lose their roots when not watered enough. Of course, you have to be careful not to overwater so it rots. The challenges of cacti are many!
I believe, but do not know for sure, that these and the others that lost their roots were due to the winter rains. So now they have no roots for water uptake. I guess that I can just trash them. Xuling
Xuling, once these plants start flowering they're done growing the main body. The only new activity from here on out is going to be in the cephalium (furry top part). So it's not going to do much except flower and grow tufty. These plants are supposed to be more difficult root-wise after they become mature.
It seems like there are two kinds of surprise flowers in the succulent world: flowers of exuberance and flowers of desperation. I've had rootless aloes grow complete inflorescences on the compost pile, putting all their energy into one last shot at fertility before they shrivel up and die. Aloe vera does this even though it's totally incapable of making fertile seed. How ironic.