Yellow flag iris
Iris pseudacorus
Yellow flag iris
Other Common name: Yellow flag iris
Description
This is an aquatic perennial growing in leafy clumps up to 2 m tall, and arising from dense rhizomes (up to 3 cm in diameter). Sword-like leaves emerge in fans from a reddish base. From October to December it produces pale-yellow to golden-orange flowers (up to 12 cm in diameter), followed by seed capsules containing many brown, flattened, three-sided disc-like seeds.
Impact
Yellow flag iris is poisonous to humans and animals. Rhizomes form dense floating mats, and the plant overtops native species that grow on margins of water bodies, including estuarine areas. It can also invade flood-prone pasture.
What to do
Contact your regional council to determine the status of this species and responsibility for control and/or advice on control.
Page last updated: 20 March 2009