Yellow Flag Iris (Iris pseudacorus)

Yellow flag iris is a popular ornamental in North America that is planted in natural and artificial wet areas within urban and rural landscapes. It is particularly popular as a large and colorful flowering element in ponds and has been planted in wastewater ponds where it is used to remove heavy metals. Unfortunately, I. pseudacorus commonly escapes from cultivation. The species has naturalized extensively and is currently distributed across the United States.