description Yellow Flag Iris Overview
Yellow flag iris (Iris pseudacorus) is a rhizomatous perennial in the iris family, Iridaceae, that grows in wet soils, marshes, pond margins, and shallow water. Native to Europe, western Asia, and northwestern Africa, it produces tall sword-like leaves and conspicuous yellow flowers in spring or early summer. It has been introduced widely outside its native range, including North America, where dense colonies can replace native wetland plants and interfere with access to waterways. Its vigorous growth has led many authorities to manage it as an invasive species.
help Yellow Flag Iris FAQ
What is yellow flag iris?
Yellow flag iris is Iris pseudacorus, a rhizomatous perennial in the iris family, Iridaceae. It is known for tall sword-like leaves and bright yellow flowers.
Where does yellow flag iris grow?
It grows in wet soils, marshes, pond margins, and shallow water. Its rhizomes allow it to persist in saturated ground and spread along waterways.
Why is yellow flag iris associated with ponds?
The plant is adapted to wet habitats and can grow with its roots and rhizomes in waterlogged soil. Its large leaves and yellow flowers make it conspicuous around pond edges.
Is yellow flag iris native everywhere where it grows?
No. It is native to Europe, western Asia, and northwestern Africa, but it has also been introduced and naturalized in other regions. Its spread can be a concern in some wetland habitats.
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