Priority 2A Weed common in isolated areas of Montana. Toxic to livestock, dogs, cats and humans and chokes out waterways. Can be controlled with mechanical, cultural and herbicide. It is a perennial with an extensive root system.  Habitat can include along shorelines, ditches, stream banks, floodplains, forests, areas of shallow water, low-lying wetlands and fish ponds. This plant is currently sold as an ornamental. Each large seedpod can produce 120 seeds. Yellowflag is one of two species of iris known to occur in Montana outside of horticultural plantings; it is the only yellow one. If you think you see it, report invasive plant to your County Weed Coordinator. Information and photo above from: mtweed.org.

---