Dear Justin, The yellow Iris is definitely Iris pseudacorus. It grows naturally here in Southern Germany and is not invasive. - But different continent, different behaviour. There are also white coloured varieties growing wild: http://aquanimal.de/images/content/… g Best Wishes Markus Breier _____________________ gardening near Munich, Bavaria, Germany USDA 6b sunshine and warm weather (23°C), spring flowering plants look fantastic these days