About
Iris korolkowii, the Korolkov iris, is a rhizomatous herbaceous perennial to 40�60 cm with narrow, glaucous leaves and creamy-white flowers intricately veined with maroon-brown on both standards and falls, in early summer. A choice and beautifully marked iris for a sunny, very well-drained, sheltered border or raised bed.
About the genus
Iris, the irises, are rhizomatous or bulbous perennials producing narrow, often sword-shaped leaves and distinctive flowers with three large, spreading or pendent fall petals alternating with three erect standard petals. They flower from late winter to early summer in every colour of the rainbow.
Growing conditions
SunlightFull sun
Soil typeChalk, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureWell-drained
AspectSouth-facing, West-facing
ExposureSheltered
UK hardinessH4
Plant details
Plant typeHerbaceous Perennial
HabitClump forming
FoliageDeciduous
Height0.5-1 metres
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesGravel garden, City and courtyard gardens, Cottage and informal garden
Native toC Asia
ToxicityHarmful 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
Care notes
CultivationGrow 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
PruningRemove old flower stems after flowering, and any dying foliage
PropagationPropagate by seed, or by division of rhizomes after flowering; for more advice, see dividing irises
Pest resistanceMay be susceptible to slugs, snails and thrips
Disease resistanceMay be susceptible to aphid-borne viruses, bacterial soft rot and grey moulds; see Iris diseases