Shoutout to the old timer in Eugene who caught my flush cuts from the ground
For about six years I finished every pruning cut flush against the trunk and figured I was doing clean work. Then a retired climber named Walt watched me on a maple job in Eugene last spring and asked why I was cutting off the branch collar every single time. He grabbed a stub I had just left, pointed at the little swelling I had shaved right off, and said the tree was already closing that wound before I touched it. Now I leave the collar and my cuts close way faster, so how do you all judge where the collar ends on thin barked stuff like birch?