Myriad Botanical Gardens - Oklahoma City, USA

Common name: Yellow Flag

Family: Iridaceae (Iris family)

Distribution: Europe

IUCN Red list: Least concern

Hardiness: 5a

Life form: Perennial plant

Comments: It is an herbaceous flowering perennial plant, growing to 39"–59" tall, with erect leaves up to 35" long. The flowers are bright yellow, with the typical iris form. I. pseudacorus grows best in very wet conditions and is often common in wetlands where it tolerates submersion, low pH, and anoxic soils. The plant spreads quickly by both rhizome and water-dispersed seed. While it is primarily an aquatic plant, the rhizomes can survive prolonged dry conditions. This plant has been used as a form of water treatment since it has the ability to take up heavy metals through its roots.