Dawn redwood, always deciduous?
As above really. About ten years ago I grew some redwoods from seed and the seeds were labeled as dawn redwood. Fast forward a few years, after not really thinking about it much, I realised that my tree doesn't lose its foliage. I only kept one and it lives outside in the cold but even after this recent cold snap, it's still green and happy. I have a giant redwood as well and a coastal redwood but the others have their young foliage, so I can't really compare.