• 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

Iochroma australe

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

© RHS

  • Synonyms Acnistus australis
    Dunalia australis

  • Family Solanaceae

  • Genus Iochroma are evergreen or deciduous shrubs or small trees, with simple, pointed, oval leaves. The nodding or hanging tubular or trumpet-shaped flowers may be purple, blue, red, white or yellow and are followed by pulpy berries enclosed in a large calyx

  • Details I. australe is a half-hardy shrub or small tree, evergreen if grown under glass, normally deciduous outdoors. The leaves are downy and the trumpet-shaped, hanging flowers are an unusual, dark lavender-blue

  • Plant range Bolivia to Argentina

Characteristics

  • Foliage Semi-evergreen

  • Habit Bushy

  • 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)

    H3

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation May survive outdoors in mild areas in free-draining soil in a warm, sheltered position. Otherwise grow in an unheated greenhouse in loam-based potting compost in bright to moderate filtered light. Pinch young plants to encourage bushiness. Good in a patio pot taken in for winter

Propagation Propagate by seed sown at 15°C in spring, or by softwood cuttings in late spring, or semi-ripe cuttings in summer

Suggested planting locations and garden types Wall-side Borders City & Courtyard Gardens Patio & Container Plants Sub-tropical Mediterranean Climate Plants

How to care

Pruning Pruning group 9, or pruning group 12 as a wall shrub. Plants grown under glass may need restrictive pruning in late winter

Pests May be affected by glasshouse red spider mite and glasshouse whitefly indoors

Diseases Generally trouble free

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