Spiney Sea Urchin won't increase much here either. I tried to give most of it away a couple of years ago but I still see that I have a couple of fans. I do fertilize every year and doesn't seem to matter much. I use milorganite and a slow release fertilizer similar to osmocote. I don't hardly ever get rebloom in my zone either. I'm tr;ying to think of some others that are slow increasers and I'll let you know. OH, Angel's Smile has been the same 2 fans for over 5 years here.
