Lithops are late summer thru winter growers and are dormant now. Here is a pic of some of my Lithops. They look like crap, but they won’t in a couple months. Lithops absorb everything out of the old leaves for the new. Once this reabsorbing process is done, all that’s left of the old leaves is paper. This paper protects the Lithops from the summer sun. They will also shrink into the mix, almost burying themselves. The little guy below doesn’t want to come out, but once the growing season comes, it’ll plump up and burst thru the papery sheath. They really don’t need water when they absorb the old leaves for the new, if they do get too much moisture during this time, problems can occur. I‘m fairly certain that’s what happened to yours. I’ve seen this happen to others’ Lithops. The old leaves will burst or rot and expose the underdeveloped leaves underneath. I have never had success growing underdeveloped Lithops leaves. They bruise super easy and never fully develop. Your first instinct is to take off the old leaves, but whenever I’ve done this the new leaves never make it. I would leave the old set of leaves on and cross my fingers. Hopefully the old leaves will protect the new underdeveloped leaves as they mature a little bit. Don’t hold your breath tho. Who knows you may have success at this🙂. I’m telling you what I would do, but they are yours, so do what you feel is right. I’d leave them be for a month or so. No water, no nothin during this month. Around mid to late August is when their growing season starts, this is a great time to repot into a new faster draining mix. About a week after the repot is when to water. I water mine from mid August thru December. Give or take a month. Winter thru spring is when they absorb the old for the new, and really don’t need water during this time. Others grow their Lithops differently, but this is what I do🤪. More Lithops info.

It’s in a drainage pot inside the ceramic pot, it’s not been watered for about 2 weeks! I thought over watering too but I’ve only watered it twice since buying it in mid December! it could be cold As the house gets quite cold in the day? I’m just wondering if it’s salvagable? I’ve cut off the rotting bit and am hoping it helps 🤷🏼‍♀️

@SylviaWW 9a Hot dry SoCal in hot conditions where the sun is brutal, any distance you can put between the physical plant tissues and the hot, reflective, heat-radiating wall surfaces will help. Allowing air circulation behind the roses, between them and the wall will not only help to permit the heat to dissipate, but will also reduce the amount of water stress caused by the hot wall literally cooking the moisture out of the roses. The hotter it is, the more they sweat (transpire) and you can literally force them to contract fungal issues, most notably rust and mildew, from severely water stressing them. Growing grass around them will increase the possibilities of water stress as the turf competes with them for water. The rose feeder roots will grow within the top few inches of soil and that's where the grass roots are. Ideally, there wouldn't have to be lawn around them, only a deep organic mulch to keep the soil moist and cool. But, the reality is, you have to do, what you have to do. Good luck!

@Mischievous Magpie (CO 5b) it was actually a pretty well developed plant in the 2.5 gallon DA container. I would guess about 1.5 to 2 years old. I purchased it from Cattail Creek Gardens.