I collected a large olive stump last November and put in large wood box with pumice. The stump had shot up five or six talk shoots about 1 to 1 1/2 inches in diameter and 6 or more feet tall. I trimmed those back to about 2 feet. I left an older trunk of 3"-4" and 2 feet tall that had emerged from the old stump. Have watered throughout winter and spring. The small leaves dried out and nothing new is emerging, though when I use fingernail anywhere on the trunk or remaining branches, it's green. There weren't many roots on the stump when I dug it up. I'm contemplating removing from box and flat cutting the bottom to expose cambium that might grow roots. Any advice appreciated., especially before I take this drastic measure. The tree had grown on a hillside, and is therefore slanted on the bottom; I planted it in the box in a slant.