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Herbaceous Perennial

Iris stolonifera

stolon-spreading iris

A rhizomatous herbaceous perennial, 30-60cm high, with prominently-veined blue-green leaves 0.5-1.5cm wide, and flowers 8cm across in late spring or early summer. Flowers vary in colour from pale lilac to deep brownish-purple, the falls darker than the standards; both standards and falls are veined, and flushed at the edges, with purple or brown; the beards are white, cream, yellow or blue; it is dormant in late summer

Synonyms

Iris leichtlinii

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Ultimate height

0.1–0.5 metres

Time to ultimate height

2–5 years

Ultimate spread

0.1–0.5 metres

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

South–facing or West–facing

Exposure

Sheltered

Drought resistance

Yes

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical 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: Unresolved
Plant range: C Asia

How to grow

Cultivation

Grow in very well-drained soil, in full sun, and with the top surfaces of the rhizomes exposed so that they get baked in summer sun, which encourages flowering; best grown in a bulb frame in containers using gritty, free-draining compost, and kept dry during late summer and winter; may be grown outside in a well-drained sunny site on a bank or in front of a sunny wall, if given protection from heavy winter rain

Propagation

Propagate by seed, or by division of rhizomes after flowering; for more advice, see dividing irises

Suggested planting locations and garden types

City and courtyard gardens
Rock garden
Gravel garden
Wall side borders

Pruning

Remove old flower stems after flowering, and any dying foliage

Pests

May be susceptible to slugs, snails and thrips

Diseases

May be susceptible to aphid-borne viruses, bacterial soft rot and grey moulds; see Iris diseases

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