This is Boehmeria cylindrica, also known as False Nettle and Bog Hemp. These plants prefer a moist semi shady area. They are nettles that can not sting you; How nice is that. It has very small yellow green flowers. This is the larval host plant for the Red Admiral, Milberts Tortoiseshell, Question Mark and Eastern Comma butterfly caterpillars. This plant does well in full sun and does not mind light shade. USDA Hardiness Zone 4 to 10.