Methods for forming high aspect-ratio conductive regions of a metallization network with reduced grain boundaries are described. Aspects of the invention include forming a trench in a dielectric material on the substrate. A conductive material is formed in the trench, wherein the conductive material includes a first grain boundary level. Portions of the dielectric material are removed to expose sidewalls of the conductive material. The conductive material is annealed to reduce the first grain boundary level.