Iris 'City Lights' Dunn (TB)
A clump-forming, rhizomatous herbaceous perennial with sword-shaped grey-green leaves and large, lightly fragrant, ruffled, dark violet-blue to white flowers with pale yellow beards, appearing from late spring to early summer
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Size
Time to ultimate height
2–5 yearsGrowing conditions
Moisture
Well–drainedpH
Acid, NeutralColour & scent
| Stem | Flower | Foliage | Fruit | |
| Spring | Purple Blue White Yellow | Grey Silver Green | ||
|---|---|---|---|---|
| Summer | Purple Blue White Yellow | Grey Silver Green | ||
| Autumn | Grey Silver Green | |||
| Winter |
Position
- Full sun
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered Hardiness
H7Botanical details
- Family
- Iridaceae
- Native to GB / Ireland
- No
- 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
Accepted
- Horticultural Group
- Tall Bearded irises are herbaceous rhizomatous perennials to 70cm or more, with flowers 10-20cm across, bearded on the falls, in late spring and early summer
How to grow
Cultivation
Grow in well-drained, fertile, neutral to slightly acidic soil in full sun. Do not cover the rhizomes with mulch, or allow other plants to shade them; sun on the rhizomes encourages flowering. Give a high potash feed in spring and divide every three to four years. See also bearded iris cultivation
Propagation
Propagate by division of rhizomes from midsummer to early autumn, see dividing irises
Suggested planting locations and garden types
- City and courtyard gardens
- Coastal
- Cottage and informal garden
- Flower borders and beds
- Wall side borders
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; see Iris diseases
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.