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Iris pseudacorus

Yellow Flag

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Key information

Plant type


Flower colour






Skill level


Iris pseudacorus

Plant details

Few garden ponds are large enough to contain this vigorous water iris. Large clumps of green leaves produce elegant, yellow flowers. Ideal for wildlife gardens, it can become invasive. It 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.

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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