I’ve had G. Rozanne in my garden for quite a few years. I’m somewhat disappointed with its lack of vigour and flowering. Recently I went to my fav. nursery to purchase a couple of new specimens, with the hope to get more flowers in the G. Rozanne patch. They didn’t have any, and suggested G. ‘Orion’ as a very similar replacement. These 2 cultivars are indeed very similar, although not identical. The foliage is definitely different. There is really not much difference in their shade of blue.