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Search by plant name, key attributes or both to find plant details and a list of suppliers.
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names Algerian iris Algerian winter iris
winter iris
Synonyms Iris stylosa
Family Iridaceae
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
Details I. unguicularis is a vigorous evergreen rhizomatous perennial to 30cm in height, with copious dark green leaves and very fragrant, deep violet flowers 5-8cm in width, the falls marked with white and deep yellow at the base, in late winter
Plant range N Africa to SW Asia
Foliage Evergreen
Habit Clump-forming
Fragrance Flower
Toxicity Ingestion may cause severe discomfort. Wear gloves and wash hands after handling
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H5
Full Sun
Aspect South-facing or West-facing or East-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureWell-drained
SoilChalk, Clay, Loam, Sand
pHAlkaline, Neutral
Ultimate height 0.1-0.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Grow in well-drained or sharply drained neutral or slightly alkaline soil. Ideal at the base of a sunny wall
Propagation Propagate by division from midsummer to early autumn, plant immediately in flowering positions
Suggested planting locations and garden types Banks and Slopes Cut Flowers Flower borders and beds Wall-side Borders Coastal City & Courtyard Gardens Cottage & Informal Garden Patio & Container Plants
Pruning Cut back after flowering
Pests Slugs and snails may be a problem
Diseases May be subject to bacterial soft rot, grey moulds and a virus
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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.