Watching the progress of my tiny Lithops collection has been fascinating. The changes are so dramatic that these little oddities are growing on me, even though initially I did not want to get involved with learning about a completely new succulent family. When I posted a photo of my new purchase one month ago, there was no evidence that new leaves were forming inside the plants. Now, new leaves have completely emerged on three Lithops and the other two have new leaves just starting to push through the split sections.
As you can see, the new leaves have pushed aside the old leaves. These new leaves gradually consume the old leaves for moisture and nutrients. The plants receive no water during this process. Probably by May, all that will be left of the old leaves will be their dried skins. At that time, the plants will receive water for the first time since the start of winter. In the fall, if the plants have received enough light, flowers will emerge from the center of the leaves. Watering will continue until winter and then the process begins again.