Populus tremula ‘Erecta’
This columnar form of aspen is perfect for tight spots and an elegant addition to any landscape. Bronze foliage emerges in the spring, turning a striking green in summer than amber in fall. It has a dense canopy, with branching starting near the ground. A Fast growing, popular tree, the Swedish Columnar Aspen will grow to about 30ft tall and 3-4ft wide. Zone hardy for Calgary and area. Plant 6ft apart.