1L Yellow Flag - Iris pseudacorus

Code: PL0805
1L Yellow Flag - Iris pseudacorus
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1L Yellow Flag - Iris pseudacorus

Yellow Flag - Iris pseudacorus - 1L Pot

Iris pseudacorus is a herbaceous perennial which can grow up to 1.5m in height. This plant, with its cheerful yellow flowers, will add a splash of colour to your garden. In the spring, its green foliage will bring the life back to your flower beds, and pond edges. In the summer, its bright blooms will grow up to 10cm in width, with delicate brown veins appearing in late summer. It is also known as the Yellow fleur de lys because of its beautiful ornamental shape.


  • Flower Colour: yellow
  • Foliage Colour: green
  • Approx. Growth Height: up to 1.5m
  • Approx. Spread: up to 1.5m
  • Flowering Time: summer
  • Uses: gardens, beds and borders
  • Tolerance: tolerant of cold temperatures
  • Growing Habit: suckering
  • Exposure: exposed, sheltered
  • Toxicity: ingestion may cause severe discomfort
  • Hardiness: hardy
  • Rate of Growth: will reach maximum height in 2-5 years
Size Options
Supplied AsTitle Price Link
9cm Pot
£17.99 View Here
1L Pot
£14.99 This Product
3L Pot
£20.99 View Here


  • Light Requirements: full sun, partial shade
  • Soil Requirements: clay, loamy, acid
  • Moisture: moist, fertile


This plant will thrive in moist, poorly drained, humus-rich soil, such as is found at the margins of ponds and streams. It is a vigorous plant, which can reach a spread of up to 1.5m, so choose your planting site with care.

Caring and Maintenance

Remove dead flowers and old flower stems after flowering period to encourage new growth. Dead or dying foliage can be removed in the autumn. Propagate by division from midsummer to the beginning of autumn - replant immediately.

RHS Award of Garden Merit

The Award of Garden Merit or AGM is an award made to garden plants by the British Royal Horticultural Society after a period of assessment by the appropriate committees of the Society. Awards are made annually after plant trials (which may last for one or more years, depending on the type of plant being trialled) at RHS Garden, Wisley and other RHS gardens, or after observation of plants in specialist collections. This is intended to judge the plants' performance for conditions in the UK.

Below is a comparison of pot sizes. From left to right: 9cm Pot, 1L Pot, 3L Pot


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