Iris pseudacorus

Yellow Flag

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Key information

Plant type


Flower colour






Skill level


Iris pseudacorus

Plant details

Iris pseudacorus is a vigorous water iris, typicallly found growing at the egdes of large, sunny ponds. It bears large clumps of green leaves from which elegant, yellow flowers appear in late-spring.

Iris pseudacorus is ideal for wildlife gardens, and looks particularly good if planted in naturalised drifts among other moisture-loving plants. It also associates well with dark blue flowered plants. If you don't have room for a pond or bog garden, try growing it in a large container filled with water. Divide clumps every three to five years to keep it under control.

Family: Iridaceae

Genus: Iris

Species: pseudacorus

Plant type: Marginal

Flower colour: Yellow

Foliage colour: Mid-green

Feature: Flowers

Sun exposure: Full sun, Partial shade

Soil: Moist, Boggy

Hardiness: Hardy

Skill level: Beginner

Height: 120cm

Spread: 100cm

Time to plant seeds: October to March

Time to divide plants: October to March

Flowering period: May to July

Reader reviews


This is an absolute thug if you let it. It has even come up in a pot as well as most of my borders and has spread the length of my ditch in deep shad.

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