As I was driving through the Wind River Canyon this week, I saw showy purple flowers along the roadside. I stopped to take a closer look and found dame’s rocket moving out of what appeared to be a flower bed, across the road, and down toward the river. The species has been widely planted as an ornamental and has been treated as relatively benign. It certainly seems to be moving unaided in this situation. It is a short-lived mustard that may form dense stands and compete with native vegetation. The species has a building reputation as an invader to be reckoned with in many states: http://www.agannex.com/weeds/dames-rocket-experiencing-explosive-growth-of-an-invasive-weed. This is the first time I have noticed this patch moving outside the area where it was planted. Keep an eye out in your area for any escapees, those showy flowers are easy to spot at highway speed.