I have to move an 'ōhi'a tree that's unhappy with where I planted it. Too wet, meaning too much lava too close to the surface, and near it. Our entire yard is underlain by a smooth, hard-surfaced lava flow. So yesterday I was probing with my father's 'o'o, searching for a place where the lava was relatively far under the surface. And I found one place. Later today or tomorrow I'll dig a hole and move the tree.