This is my daughterâs moon cactus (I think). Iâm not normally a cactus mom, so Iâm not sure what to do with it. The bottom looks like it has some sort of discoloration or rot, but it is not mushy at all - it is completely dry. The marking is around most of the bottom (the base pictures are two different sides). Iâve never heard of an underwatered cactus and I did water it about 12 days ago. It sits in the sun in our bay window and gets very bright light all day. What is the dry mark by the bottom? Is this something I should be concerned about? The soil is dry and planta says that I should water it today, but before I do that, I just wanted to weigh in and see how to take care of this plant. Any advice greatly appreciated.


