My plant I was told was a desert rose. Has collapsed in half. I cut it under the collapse and then cut the top that was seperated above the collapse. Will these two pieces grow? And recover? How do I, if possible, root and plant the top half. Its never been super hardy.. Only mild growth over almost 2 years. Its very small. It hasn't gotten a lot of direct Sun in my apartment which will be changing soon. I will be moving to a place with a balcony finally. I think with afternoon sun I have killed almost every cactus and succulent since I've lived here.. :-(
I'm having issues posting a picture.. I will try in another post

There is a complete 'Adenium' group where people might be able to help you better - though I am sure there are plenty of Desert Rose growers among the Cactus and Succulent lovers who frequent this group.

I think cuttings will grow - but be sure to let it dry out before planting it and leave of the watering - I have never tried it. They also need to be potted in very very well draining soil so they they do not sit around with wet feet a lot.

These plants do not like to be wet and cold, that is frequently fatal to most kinds. So when it gets cold stop watering or reduce it to an absolute minimum - as a result the plant might loose it leaves that is normal new leaves will grow once it gets warm in the spring.
Once it gets warmer these plants want as much sun as you can give them and when it is warm and staying that way at night they can take quite some water.

Thank you! I actually thought it was a succulent of some sort..lol
I will repost in that group too.. Thank you!

I am guessing your plant is Dorstenia or some other succulent, based on the prominent leaf scars along the stem. Maybe a clear leaf shot would help resolve that question. In any case I think all of Thijs' advice would still apply.

Hello Alli, Adeniums are such sun loving plants that loves warm to hot temps, and typically depending on location and temps, it may just be waking up now or already awake. Mine is just barely waking up this year. It has been one quirky cool Spring season. They typically go dormant during the cold season and will then wake up this Spring and do their lovely active growth during Summer.

Looking at your plant, I am a little thrown off track since the stem is quite slim, maybe it is not grown from seed? You did right by cutting off the rotten part. Let that top half callus an dry. I would also inspect the roots of the remaining part just to see how the roots below soil line looks like. Typically, if the part under the soil is looking too soft, your media is too wet, so need to unpot and get that lower part to air dry, otherwise it will just continue to rot.

They are succulents since they hold water in their caudex (stem to root part), so it is really important to have a very well draining media and wait for new growing leaves to be sure it is already properly awake from its slumber.

It is also possible it is not an Adenium, so still I would unpot and check the main plant. Got to see condition of the roots.

Btw, there is a thread here that shows some of the caudex forming plants, it will help to see how gritty looking the media looks like, so you will have an idea what it really means to make it very well draining:
Good luck, hope your plant recovers in time. The good side it is Spring going into summer, their active growth time.

The thread "Bizarre Caudiciforms" in Cactus and Succulents forum