I've been trying to determine what was wrong with this Crassula tetragona since May. Had suggestions for drainage, potting mix, sunburn, etc., but not one person suspected pests. I never could upload the photo to this post in June, but there is a later photo of the damage in a post titled "What's the funk on my Crassula tetragona" in the cacti forum. Mites aren't visible. I couldn't see them even with a magnifying glass. I needed the macro lens of my "real" camera, then I had to enlarge the image. It begins as yellowing of leaves for no apparent reason. Old leaves are mostly affected, but newer leaves sometimes also. Leaves drop. Some shrivel. People mistake it for over-watering, poor drainage, sunburn, etc. As it progresses, leaves look textured with tiny indentations about pin pricked size. Leaf surfaces get what looks like a brown or black coating, stain, or discoloring. Plants continue to grow and produce more leaves and branches, but eventually only those newest leaves remain healthy. That's where my plants are now. I can save them, but it'll be a huge setback. Worse, they've been in contact with all my other plants, shared a water bucket, etc., so I'll be treating a lot of plants. Hopefully, this mite doesn't thrive so well on other plants.

Hello Hank. That's quite a dramatic change isn't it? I had exactly the reverse of that phenomenon with a piece of jade that I bought back from southern Spain several years ago. The mother plant was very pale almost lime green, very much like your plant is now, that is what caught my attention in the first place. There was a piece that had been knocked off as it was adjacent to the main paseo/pavement so I rescued it and grew several plants from it assuming they would be this pale yellow/green/red edged colour. Mother plant was left to bask in the full Costa del Sol sunlight and heat, admittedly in what looked like a poor and thin soil and with goodness knows what watering it as and when...dogs I mean as there were a lot being walked! Every piece I cut up rooted and went on to produce the usual deep green leaves I was more familiar with. They have all retained those nice red edges, but it appears to be the change in growing conditions that has caused the colour change in my case, nothing else I'm sure. That said, and this being the reverse, I would definitely unpot yours and inspect the roots as with you saying it's been wet of late, maybe there could be some root issues starting....so just to make sure. The lower leaves should as you say, drop first, upper leaves yellowing is often a bad sign. What kind of mix is it planted in...the original or has it been repotted? Mine are in very gritty fast draining mixes so no rot issues so far...but they do live inside my gh x365.

Somewhat reminiscent of dog vomit fungus/slime mold, which is harmless to plants. Al

NP, they are showing now. Pretty good looking plants. 1st needs support because it has big branches growing bit 'wildly' (that is not a criticism :), one I can see is too much to the side. Not a problem, you can just prune one off, or prune some of the smaller branches off to make it more balanced. I am only looking at the photo - but think I would prune off the left branch and the lowest big branch. When repotting, I would get original plant into more upright position. Just a suggestion... As jades get bigger, you should decide what shape you want them to grow into. That is personal preference - I like one thick stem/trunk (that's why I said to prune extra branches off). Once you decide, pruning in early spring will help to keep plants balanced and grow the way you like. Variegated jade looks like 'Tricolor' (but I can't see it clearly), and they are as easy to propagate from leaves as green ones. Sometimes they revert to all green, but will grow. They just grow bit slower in my experience. But plant is very small, and you should grow it bigger before taking leaves on - they feed the plant and help it grow. I have many grown from leaves and also from stem cuttings. The colorful plant is probably sedum and could be propagated very easily from leaves or stem cuttings.