• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Iris 'Cantab' (Reticulata)

iris 'Cantab'

iris 'Cantab'

© RHS

  • Other common names iris 'Cantab'

  • Synonyms Iris reticulata 'Cantab'

  • 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 'Cantab' is a dwarf bulb, up to 15cm high, with slender leaves and flowers in late winter and early spring. The standards are a soft, pale blue and the falls deeper blue with white stripes around a yellow-orange blotch

Characteristics

  • Foliage Deciduous

  • Habit Tufted

  • Toxicity Ingestion may cause severe discomfort

  • 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)

    H7

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing or East-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAlkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grows best in full sun in well-drained soil, or in a bulb frame

Propagation Propagate by bulb propagation in autumn

Suggested planting locations and garden types Flower borders and beds Rock Garden Patio & Container Plants Gravel Garden Cottage & Informal Garden City & Courtyard Gardens

How to care

Pruning No pruning required

Pests May be affected by aphids, iris sawfly, leafminers, slugs and snails

Diseases May be affected by blue mould, iris ink disease, iris scorch, leaf spot, narcissus basal rot, rust diseases, and virus diseases

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