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Canna 'Erebus' AGM

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© RHS 1999

Characteristics

Plant type

Conservatory/Greenhouse or Herbaceous Perennial

Habit

Bushy

Resilience

Hardiness

H3 (half hardy - unheated greenhouse/mild winter)

Colour

Flower

Pale Pink in Autumn and Summer

Foliage

Blue and Green in Autumn and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

water canna

Family

Cannaceae


Canna are rhizomatous herbaceous perennials with erect stems bearing ovate leaves, with showy flowers with showy petal-like staminodes and small, coloured petals and sepals, borne in racemes or panicles in summer and autumn

'Erebus' grows to 1.7m, with blue-green foliage and pale coral-pink flowers in summer and early autumn

Other common names

  • canna 'Erebus'

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or West-facing
  • Sheltered

Cultivation

In summer, water cannas (often bred from Canna glauca) can be placed in containers in ponds with no more than 15cm (6in) of water over the roots. They are also suitable for well-watered borders or conservatories where potted plants can be stood in deep saucers of water. Before autumn frosts, bring plants from outdoors into a frost-free greenhouse or conservatory. Keep the pots moist but not saturated. In April, increase temperatures and plant the sprouted plants out in late May when the risk of frost has passed. Further canna cultivation advice

Soil

  • Poorly-drained
  • Alkaline, Neutral or Acid
  • Loam

Propagation

Propagate by seed at 21°C (70°F) in spring or autumn. Soak seed in warm water before sowing. Cultivars may not come true from seed. Propagate by division in early spring

Suggested planting locations and garden types

Architectural, City/Courtyard Gardens, Coastal, Cottage/Informal Garden, Flower borders and beds or Patio/Container Plants


How to care

Pruning

Deadhead to promote continued flowering. Leave to dieback in autumn

Pests

Glasshouse red spider mite, slugs and caterpillars may be troublesome

Diseases

Canna can be susceptible to a virus