If you don't wait too long, this is pretty easy to do. Just snip the sucker growth off at the base, then use the chisel, gently, to smooth the surface of the trunk. The little wounds heal very quickly, and you are left with that beautiful, gnarly look at the base of the tree. If you do this regularly, the base of the trunk gets more interesting all of the time. A little bit of trouble, but to me, it's worth it.
|Base of the trunk of an olive tree|