Oak - Green Pillar (Columnar)A Narrow, Upright Oak with Classic Beauty for Space Saving Landscapes The Oak Green Pillar is a distinctive, columnar oak prized for its tall, upright growth habit and strong architectural presence. This cultivar of English Oak is ideal for landscapes where space is limited but a stately tree is desired. With dense green foliage, excellent durability, and a narrow footprint, Green Pillar Oak delivers the timeless look of an oak without the wide