plantladylin,
What really throws me is the second site describes it a growing three to four feet tall and shows it blooming. Now it may grow that tall, and it may bloom, and it just gets cut or pulled before it ever reaches that height, but I have never seen anything to indicate to me this plant would do that. Out of the hundreds and hundreds of them in the yard at my Mom's I would have thought at least one would have lived to reach the blooming stage. These plants are just a couple of inches tall, I am about ready to just call it mugwort out of desperation. I am going to keep my eye on it this summer if that house doesn't sell and just see what it does, I am going to pull all I can and leave a few for testing.