At the bottom of this photo, just above the plant tag, you can get a glimpse of the leaves - that lighter stripe shows where they are hiding in the shadows. It may be a normal trait and it may be the partial shade my plant lives in, but the foliage loses its deep purple tone when the plant starts blooming, however, the flower stems are nearly black - quite neat. I have seen catalog photographs depicting the flowers as a startling, bright, chartreuse-yellow or even orange. Well, the flowers on my plant were much more subdued. This photograph shows them as they are fading a bit, so they were a little brighter, but not much.
Flower stems extend the height somewhat.
I've got it in a bed with very sandy soil and good drainage. It appears that, like most euphorbs, the bloom stalks will need to be removed as they brown off. If you like purple foliage as much as I do, give this one a try. I am thinking that it would be more effective backed by Artemisia x 'Powis Castle'than the green foliage that's behind it. Since renovating this bed is on my list, I may just give that a try.