Cerulean Warbler is on my lost and tossed list. It couldn't survive in my evergreen garden. I don't have enough cold weather in the winter to satisfy this plant. I sent it to a friend who lives a couple of zones north of me and it is flourishing there!
It is one of the few Lambertson's that survives my Zone 5 winters. It is very popular with garden visitors. I have yet to see what it looks like beyond 4 fans.
Mine would only bloom every other year. I lost all except one fan three winters ago. The one fan was really small and didn't thrive, so I tossed it. The bloom was exquisite though, and I do miss it.