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Lithops at all 4 stages
(lemmy.ca)
My lithops have been in various stages of splitting for the past few months. They have decided to show the process all in one pot! The potting medium is perlite.
The bottom right one has been very fickle and is taking its sweet time. I don't want to water it, but it does look crusty indeed. I suppose each plant takes its splitting journey at its own pace. The topper that you see is large perlite. I use natural aquarium gravel for my other succulents.