Balsam Poplar Populus balsamifera 1. Only for demo purposes. Suckers of all poplars will spread. Impressive balsam odour of foliage. Eastern Cottonwood Populus deltoides spp.
Seeds make a mess.
Plant away from formal areas. Can become a very large tree. Trembling Aspen Populus tremuloides 1. Not a long lived tree, but very important ecologically. Plant as demo only.