Iris pseudacorus (yellow flag, yellow iris, water flag) is native to Europe, western Asia and northwest Africa.

It is an herbaceous flowering perennial plant, growing to 100-150 centimetres (39-59 in) (or a rare 2 metres (6 ft 7 in)) tall, with erect leaves up to 90 centimetres (35 in) long and 3 centimetres (1.2 in) broad. The flowers are bright yellow, 7-10 centimetres (2.8-3.9 in) across, with the typical iris form. Iris pseudacorus grows best in very wet conditions, and is often common in wetlands, where it tolerates submersion, low pH, and anoxic soils. While it is often grown as an aquatic plant, the rhizomes can survive prolonged dry conditions, and can be grown in regular garden soil.

The plant was rated in second place for per day nectar production per flower in a UK plants survey conducted by the AgriLand project which is supported by the UK Insect Pollinators Initiative. Large I. pseudacorus stands in western Scotland form a very important feeding and breeding habitat for the endangered corn crake.

This variegated cultivar has gained the Royal Horticultural Society's Award of Garden Merit.

Type: Hardy perennial

Hardiness zone: 5-8

Location: Sun to part shade

Height: 150cm, 60"

Seeds per packet: 5 Large seeds