An arbor stake stabilization member comprising a body including an annular ring of a biodegradable material having an axial passageway therethrough. A locking member is coupled to the annular ring and extends radially inward into the axial passageway. A plate of a biodegradable material extends circumferentially outwardly from the annular ring. The perforated plate includes multiple openings. In use, the arbor stake stabilization member may be placed underground and on or above a rootball of a tree. The locking member is sized to accept an arbor stake therethrough in an interference fit. The arbor stake may extend from the top of the rootball through the rootball and into the undisturbed soil at a point below the rootball. Over time, the arbor stake stabilization member biodegrades.