This is a pretty neat looking plant, definitely reminds me a a Lilac, but I get that if it is an invasive species. I was up in the mountains a few years back and found some huge area of large trees/shrubs near a logging clearcut, that were thick and beautiful with what I recall is a very similar if not the same flower. Again, I thought it was amazing and in our area of the world most everything grows like it is from the Garden of Eden. If this is in full bloom, I am going to have to go on a hike this weekend and see if I cannot find it again and post some pics.