• 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

Dichorisandra thyrsiflora

blue ginger

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
blue ginger

© RHS

  • Other common names blue ginger

  • Family Commelinaceae

  • Genus Dichorisandra are upright evergreen perennials with leaves spirally aranged or in two ranks, and 3-petalled, blue or white flowers in racemes, followed by capsules splitting to reveal dark orange seeds

  • Details D. thyrsiflora is an erect perennial with short, rhizomatous roots and spirally arranged, lance-shaped lustrous dark green leaves, 20-30cm long. Deep violet flowers 1-2cm across are produced in dense racemes, 13-20cm long, in autumn

  • Plant range E Brazil

Characteristics

  • Foliage Evergreen

  • Habit Suckering

  • 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)

    H1B

Colour

Sunlight

  • Full Sun

  • Aspect West-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • MoistureWell-drained

  • SoilLoam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 2-5 years

How to grow

Cultivation Under glass grow in loam-based potting compost (JI No3) in bright filtered light and high humidity. Water freely in the growing season and apply a balanced liquid fertiliser monthly; keep just moist in winter

Propagation Divide or root stem cuttings at any time

Suggested planting locations and garden types Sub-tropical

How to care

Pruning No pruning required

Pests Mealybugs may be troublesome

Diseases Generally trouble free

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