This rhizomatous laevigatae iris has tall upright branched stems and forms a clump. It has mid green long linear leaves and the yellow beardless saucer-shaped flowers appear in clusters high amongst the foliage from spring to summer.

Hardiness zones 5 to 9 

Iris pseudacorus is naturally found from Europe to a western Siberia, Caucasus, Turkey to Iran and northern Africa growing in damp places in or beside ponds or along water courses. It prefers an open sunny position with some wind protection and grows in well drained to wet organic rich, fertile soils that are tending acidic and is frost tolerant but drought tender. 

Yellow Fag Is grown for its clumping habit, and flowers. It is planted in parks and gardens along water courses or in and around ponds as a feature plant or used in moist perennial beds along borders. It is suitable for inland or coastal regions establishing from division in one season and is moderately long lived. This iris may also be grown in containers and is suitable for sunny courtyards. ID 2818

Note:
Laevigatae iris are bog plants that grow freely in continuously wet soil or along the margins of ponds or creeks.

Iris (EYE-ris) pseudacorus (SOO-dah-KOR-us)

Iridaceae (eye-rid-AY-see-ee)
Iris Family