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Conservatory GreenhouseHerbaceous Perennial

Canna 'Erebus'
  • RHS AGM

water canna 'Erebus'

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

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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Loam
Moisture
Poorly–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring
Summer Pink Blue Green
Autumn Pink Blue Green
Winter
Position
  • Full sun
Aspect

South–facing or West–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Cannaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy
Genus

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

Name status

Accepted

How to grow

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

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
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Architectural
  • Coastal
  • Flower borders and beds
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

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