Iris pseudacorus
yellow iris
A vigorous herbaceous perennial, forming extensive colonies to 1.5m in height, with waxy grey-green leaves and bright yellow flowers up to 10cm in width, the falls with brown veining in the centre, in mid and late summer
Other common names
daggersflagon
see moreJacob's sword
water flag
water skegs
yellow flag
yellow fleur-de-lis
Size
Ultimate height
1鈥�1.5 metresTime to ultimate height
2鈥�5 yearsUltimate spread
1鈥�1.5 metresGrowing conditions
Moisture
笔辞辞谤濒测鈥揹谤补颈苍别诲pH
AcidColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Green Grey Silver | |||
|---|---|---|---|---|
| Summer | Yellow | Green Grey Silver | ||
| Autumn | ||||
| Winter |
Position
- Full sun
- Partial shade
Aspect
South鈥揻acing or 贰补蝉迟鈥揻补肠颈苍驳
Exposure
Exposed or Sheltered Hardiness
H7Botanical details
- Family
- Iridaceae
- Native to the UK
- Yes
- Foliage
- Deciduous
- Habit
- Clump forming
- Potentially harmful
- Harmful if eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
- Genus
Iris may be rhizomatous or bulbous perennials, with narrow leaves and erect stems bearing flowers with 3 large spreading or pendent fall petals, alternating with 3 erect, often smaller, standard petals, in late winter, spring or early summer
- Name status
Correct
- Plant range
- Europe Africa Asia
How to grow
Cultivation
Grow in wet, deep, acid, humus-rich soil in full sun or partial shade. It thrives at the margins of large ponds or streams; has the potential to become a nuisance if not managed well so plant with care
Propagation
Propagate by division from midsummer to early autumn, plant immediately in flowering positions
Suggested planting locations and garden types
- Coastal
- Cottage and informal garden
- Wildflower meadow
- Wildlife gardens
Pruning
Remove any dying foliage in autumn, old flower stems can be cut down after flowering
Pests
Diseases
May be susceptible to aphid borne viruses, bacterial soft rot and grey moulds (Botrytis)
Iris pseudacorus
yellow iris
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