I've had it for many years, it has no problems with my USDA Zone 4 winters. I don't winter mulch. Here's a pic taken a few days ago. It is planted in the afternoon shade of a honeylocust tree. The image was taken at 10.30 a.m. though, according to the image properties. I don't recall its fading but I can check on the next sunny day, today it's raining. I'm sure someone else will be able to answer that part of the question
'Lilting Lavender'
Edit: Just to add that foliage habit and plant hardiness are inherited separately, you can have tender dormants and hardy evergreens, I grow several of the latter. Also the registered foliage habit only applies in the garden of origin and can vary when grown elsewhere.
