Yep. Thanks Dave. That's the first thing that came to mind but when I checked it out it just didn't fit.
I find the barks to be so interesting being so very different on the same plant.
I'll keep watching it & see if I can get more clues in the spring. I know one thing --- the horses sure like to eat it! They were eating any portion they could reach.
But then I've seen horses eat a whole lot of things.