I’ve taken a few buckthorn from nature and learned from them. I killed 4 or 5 in my first few years but as
@Arnold says, who really cares. You can’t throw a rock without hitting 6 or 7 buckthorns around me…
I have a group of 5 planted in a forest that survived my pitiful noob years. I have no recent pics, this is from 2 springs ago I believe. Nothing special, but they are easy to work with and nearly impossible to kill.