Ken, I wanted to add a couple comments. A couple of times you mentioned using clay pots for your young Adeniums. I would advise plastic instead. Porous clay wicks the moisture out of the soil, which is great for orchids, but not so great for young Adeniums.
I lost a number of seedlings from two different batches this past winter, even though in plastic pots, because the soil dried too quickly. Other seedlings I had in the same type plastic pots thrived because the soil retained moisture better.
I currently have three one-foot tall Adeniums in 8" clay pots that need to be repotted into plastic pots. They were not thriving and were practically dormant, even though the weather was warm and they were regularly watered. I realized the soil was drying too quickly. I set the pots into a second 8" pot as a barrier to moisture loss until I could repot. Within a couple weeks the plants were all developing new leaves and buds.
They are still doing well, so I have procrastinated the repotting, but I am in the process of repotting many of my seed-grown plants, so intend to address these larger plants while in the swing of repotting.
Just my thoughts. I have read where others have stated to NEVER use plastic pots, nor glazed ceramic or clay pots, and if you MUST use plastic add dozens of additional holes. But my experience says otherwise. Standard, unmodified plastic pots work well for me.
By the way, here is one of my 9-month old seedlings in a 6" square platic pot, just repotted. Plant has never seen other than a plastic pot.
