That may well be Mary and I am thinking its too cold up where you are. I had a nice plug going in a tall container for 2 years.Last winter was the coldest on record especially March. The Blue Waterfalls is dead.
The parent I took it from is alive and well in a amended clay part shade garden.
I loved the way BWF spread in the pot and reached out.
I plan to put a FanFlower in the pot for the same effect but wont worry about not seeing it next year.