angles araucaria heterophylla Australian conifer background black branches common conifer focus foliage living Christmas tree Norfolk pine ornamental outdoor plant pine prolific pyramid shape sepia shapes silhouette symmetrical textures Australian-variety blue-sky columnar-shape coniferous cupressus-sempervirens cypress dense driveway-planting elegant evergreen-conifer golden-foliage narrow-space-growth natural nature ornamental-tree pencil-pine popular potable screening sky stately Swanes-golden-pencil-pine thin trees upright vigorous color colour depth evergreen green greenery horizontal whorls incurved indoor plant lanceolate narrow leaves overlapping potted plant spikes spiky