I'm amazed at how hardy this is. We've had -21C in Nov., yet flowers are still on it (and they're not crispy). Up against the building it hasn't had the benefit of snow cover but has been protected from northwest winds. I think the tag said Statice when I bought it last year. Stems are triangular--not round--in shape. Can I assume it's a perennial? Pic isn't great despite Fill Flash.