I've got a pot of lithops here at work and they are slowly dying one by one. It seems to starts at the bottom of the plant. It looks like the the base of the lithops is rotting. The plant will turn to mush and then shrivel up to nothing.
I used to water them once per week. I thought it was too much, so now I only water once every two or three weeks, and it is still happening....
What is going on? I need help to keep the remaining ones alive.