Ironweed was one of my mystery plants from the summer. I kept noticing it everywhere but had to do some research to find out what it was. It's in the sunflower family and can grow 7-10 feet tall. It also has a very strong stem, hence the name.
In the summer, ironweed has pinkish purple flowers that attract lots of butterflies and bees. I can't decide which way I like it best.