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Aquatic, Bog or Herbaceous Perennial
Clump-forming
Ingestion may cause severe discomfort
old H4 (hardy)
Purple in Summer
Green in Autumn, Spring and Summer
0.5-1 metres
0.1-0.5 metres
2-5 years
smooth iris
Iridaceae
Iris may be rhizomatous or bulbous perennials, with narrowly 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
I. laevigata is a rhizomatous perennial to 70cm in height, with erect, sword-shaped leaves and rich purple flowers 8-10cm in width, each fall with a narrow white flash at the base
Suppliers listed in RHS Plant Finder
Grow in moist to wet, deep, humus-rich, acid soil; thrives at the margins of ponds or streams. Tolerates some lime
Propagate by division from mid-summer to early autumn
City/Courtyard Gardens, Cottage/Informal Garden or Flower borders and beds
No pruning required
Sawflies may cause problems. Can be attacked by snails and slugs
Generally disease free
© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262