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Iris pseudacorus

Yellow Iris

Loved by Pollinators Hardiness H7

Bright yellow flowers rise above tall sword-shaped leaves on Iris pseudacorus in early summer. This vigorous native iris thrives in wet soil and shallow water, making it excellent for pond margins and bog gardens, but its spreading rhizomes need room and occasional control.
SKU: IRIS-47-Y
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Plant Details

Flowering Months

January, not a flowering month
February, not a flowering month
March, not a flowering month
April, not a flowering month
May, flowering month
June, flowering month
July, flowering month
August, flowering month
September, not a flowering month
October, not a flowering month
November, not a flowering month
December, not a flowering month

Size

Max Height
1.0 m — 1.5 m
Max Spread
1.0 m — 1.5 m
Growth Habit
Grows in tight bunches from base, forming rounded groups.

Planting Position

Sunlight Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.
Full Sun Part Shade
Aspect Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.
South East
Exposure Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
Exposed / Sheltered
Hardiness Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
Hardiness H7 (< −20 °C) Extremely hardy

Ideal Soil Conditions

Soil Type Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.
Clay Loam
Soil Moisture Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.
Poorly-drained
Soil pH Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.
Acid

Plant Uses & Merits

Merits
  • Loved By Pollinators
Iris pseudacorus

Iris pseudacorus Description

Iris pseudacorus, commonly called yellow flag iris, is a vigorous rhizomatous perennial with upright green leaves and clear yellow flowers marked with deeper veining. Flowering occurs from late spring into early summer, followed by prominent seed capsules. Mature clumps can reach around 1 to 1.5 metres high and spread strongly through thick rhizomes. Grow in full sun or partial shade in consistently moist to wet soil, including pond margins and shallow water. It is native and very well adapted to Irish conditions. Its vigour makes it valuable for naturalistic waterside planting but potentially too spreading for small ponds or mixed borders. Remove unwanted rhizomes and seed heads where control is important. All parts are harmful if eaten.

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