Marica, yes this could just be sunburn....but, that one darker spot does concern me. There’s a possibility that could be a sign of rot, even though you say the caudex is hard above and below. Sometimes rot can start in the root system and cause this type of discolouration on the outside. Hopefully it’s not.

If your weather permits maybe it would be best to unpot to check the root system. Your choice.

I checked the roots again just now. They look good. The darker spot reminds me a flake of just attached. The yellow doesn't show as well in these shots. So I will just keep an eye on it.

It needs trimmed only two branches 3cm few leaves.

It's sunburn and it's really ugly, isn't it. Hopefully, it will correct itself as the caudex expands and grows. I have the same on a few of mine. I've found that some are just genetically more prone to it than others.

If you can, move these to a tad less sun. I was very surprised to observe that some of my plants could withstand the very hot afternoon sun, just not all day (morning to evening) sun. That tells me it's not just the intensity of the sun, but the duration of exposure, as well.

I even have one with red, but not crispy leaves from so much sun ... I think it's cool.

Maria Elena

I put all of my plants in morning sun. The sun is intense. This month at 4000'. Having a heat wave, (for us) 98° 16% humidity and that's high for us. We usually low 60's at night now it's 74°

Beautiful temps, Marica. I wish we could get there even one month in the year. It is constantly avg 86F / 86% humidity here. We are on the equator, surrounded by water, with trade winds blowing in from Africa, along with hurricanes and sand storm dust from the Sahara. The plants love it ... I'm tired of being wet. Think of the most oppressive, humid weather you've ever been in ... You know, the one you couldn't wait to board an airplane to get away from ... That's us ... ALL the time. Ugh! This, too, shall pass.

The burn on yours could be from a combination of sun and dryness.

Be well!

I just trimmed most of plants and one new graft. Right now the are in full shade. There is no wind so I may have to water twice a day

I know AZ and NM has alot more moisturize then they use to. Wonder if lower altitude causes less burn

Can I just add to what others have said - adeniums are also prone to sunburn if they are turned around, exposing the other side of the plant that doesn’t usually get as much sun. In other words your plants should face the same direction all the time.

They can also get sunburn if the soil is left to dry out too long in hot conditions. A newly pruned plant is also susceptible to sunburn as it no longer has a canopy of leaves to provide shade protection :)

Also looks to dry Rachael your mix with orchid mix would work a treat for her i have steered well away from coco choir ,it is staying way to wet for to long im repoting with one part small perlite one part tumbled pine bark (orchid mix) two parts succulent mix .marica this kind of mix may help in the heat u have good luck:×)

Pete, wait for Spring to repot...not too long to go for us now :)

You could probably use 1:1:1 of your mix above.... 1 part perlite, 1 part orchid pine bark and 1 part succulent mix. Just adjust the mix till it’s pleasing to you.

Yeah coconut choir stays way to wet it would b moore suited for hot dry climate