Tall, purple, and new!!! Please help identify
I spotted these plants near the edge of our creek and they are huge, probably at least 6-8 ft tall. My guess was either Joe Pye Weed or the nasty Giant Hogweed, but they don't seem to match either one totally. I am hoping for the first one or some other non-poisonous weed, but identifying it is the start.
The stalk is 2-3 inches in diameter and the leaves look like they are unrolling from the stalk. There are unopened leaves that are still in a ball shape, and then they start to unroll.
The tops are opening up into pod-like flower/things
Here are the leaves if that helps.