Identify a perennial -?
We think this is white snakeplant, a good native perennial flower. The botanical name if Eupatorium rugosum, but used to be Algeratina altissima.
It is about to flower. If you send us photos of the flowers we can give you a definite id.
You can find out more about it in this great online publication: Native Plants for Wildlife Habitats and Conservation Landscaping: Chesapeake Bay Watershed.