Don't know 'Suow' but I remember landlord at Colvos Creek nursery site on Maury Island had a patch of C. quadrangularis going some years ago.

I have had C. quadrangularis for a number of years planted in a protected spot but also in dry shade. I used to have the Suow but gave it to my boss in trade for some other plants. Several years ago I sold many divisions from my Suow to another bambusero who loved this beauty but he lost them all in one of our bad winters. It's a double edged sword with some of these 15 degree plants. Plant them in a protected area and they don't get the sun they need to really finish there growth. Plant them in an exposed area and they are at risk of early freezes and our new @#%& ice storms we have had the last few years! Yes they will survive but will they look good? These Chimonobambusas grow amazing rhizome systems so take care where you site it!