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Did some research and discovered that Adenium should be in fast-draining ACIDIC soil
Hard to fathom (for me) that a desert plant needs acidic soil, as they're generally growing on limestone, etc.?
I learned they're definitely deciduous, and no water/too much water can cause leaves to fall.
Repotted it in better soil, with some sand.
But looks like I've got to give it some Miracid if the "acid soil" suggestion is true.
It just seems strange that a desert succulent similar to baobab tree would need acidic soil.
Acidic soils generally occur in high rainfall areas where there's a lot of decaying organic matter.
That Plumeria link is really interesting and includes black rot for adenium!
I'll deal with the scales later...the link gave some really good points about (1) warmth, and (2) NOT watering when there are no leaves, i.e. no transpiration, so rot can occur.
I mentioned before that I got one desert rose from Florida last year. It lost all the leaves during the summer, and I had to wash it a few times to get rid of bugs. I took it out in full sun in the spring and look at it now, started to bloom:
