I have sometimes left the bark on rose shoots. It starts to peel some during straightening, bubbles up and sometimes flakes off, but I just sand it away. Once in awhile it will start to get crumbly during use, but I sand and seal again. Rose has a pretty thin bark after drying though. Never tried it w/ any other shoots. I'd say some guys peel bark off because they need to, to get the weight even on their set of arrows.