I have had success with limiting Lucifer by pulling the young stalks and corms in early spring when they first emerge. They come out fairly easily, and I first define the area I will allow it to occupy and pull everything outside that boundary along with thinning the corms within the boundary. As it flowers, anything that starts leaning gets a chop back to about 2'. This sometimes seems drastic, but after cleaning up all the leaners, I still end up with a nice upright display. I think the natural form of this plant would be a fairly large diameter fountain if you have room to allow it. I also plant supporting plants directly in front of Lucifer to aid in keeping the stalks upright. Melissa and Rudbeckia have worked fairly well, and both blend nicely with the orange-red of Lucifer. This photo has some masterwort and veronica in front of Lucifer.
