How do I save this Desert Rose?
Hello, I am a new desert rose owner. I bought this plant from someone in a healthy state with a few flowers on it, but over the course of the past month it has slowly declined, with some leaves falling or turning yellow, and all the flowers wilting and falling off. I have been leaving it outside in the hot Kansas sun and have watered it 2 or 3 times. It’s been in the same nursery pot it grew up in (I’ve been putting off finding a pot for it but assumed if it grew and blossomed in that nursery pot it would be fine… the roots aren’t bulging at the sides or anything). I don’t know if it’s root rot, or no rot but overwatering, or what seems less likely is under watering. I was thinking the dark brown areas on the roots is rot, but if i scrape at it it shows a bright green flesh… idk if its just dirt stain and I scratched off some of the bark/skin. I thought I had time to learn to care for this plant given how established it is, but I fear I may be in an emergency and need some guidance!
As of right now I removed all the soil out from the roots and will let it air out in the sun for the day before I do anything drastic.