Hmm, I don't know if they're Black Giant, but I have two plants that have very dark stems, I will post a photo in a day or two---
The re-sold plants that I got from Siam Adenium seemed to take an awful long time to get started growing. Of three, only one has bloomed, and it was slightly but definitely fragrant one morning untill I sniffed all the scent away. I believe the double trip was just too hard on the plants.
I have a single white unnamed seedling that was strongly fragrant for a couple of days, I was simply sitting near it and could smell it, wheee. It's on it's next flush of bloom, and is not fragrant this time.
"Snow White" a triple white that's supposed to be fragrant has buds, oboy oboy, oboy!
Let me count--- I thimmk I have five that are fragrant. And I bet bet bet that Adeniums will, within three years, will be the most fragrant flowers alive. If the breeders can get fragrance where there was NONE, wowee, what they will have eventually will make Ylang Ylang sad. And sorry about Plumerias, they are having fragrance bred out of them, which is a crime.
This one is a bit fragrant, but the COLOR makes me swoon! "Sakda Purple"