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Conservatory GreenhouseHerbaceous Perennial

Canna × ehemanii

Ehemann's canna

Large, upright perennial about 1.9m tall, with broad paddle-shaped, blue-green leaves with red margins, and bearing large, waxy bright pinkish-red flowers on tall stems, from midsummer to early autumn

Synonyms
Canna iridiflora misapplied
© RHS 1999
© RHS 1999
© RHS 1999
© RHS 1999
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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Blue Green
Summer Pink Red Blue Green
Autumn Pink Red Blue Green
Winter
Position
  • Full sun
Aspect

West–facing or South–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Cannaceae
Native to GB / Ireland
No
Foliage
Deciduous
Habit
Clump forming
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

Correct

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How to grow

Cultivation

As a patio plant grow in pots of peat-free compost in a sheltered site in full sun. Plants can also be planted into a sunny border. Water freely and apply a high potassium feed every 2-3 weeks in the growing season. Lift the rhizomes in autumn when frost blackens the foliage. Store over winter in barely moist compost in frost-free conditions. See canna cultivation for further information

Propagation

Propagate by division in spring, or propagate by seed (sown indoors) in spring. The seed needs to be chipped or soaked in warm water for 24 hours prior to sowing

Suggested planting locations and garden types
  • Architectural
  • Cottage and informal garden
  • City and courtyard gardens
  • Coastal
  • Patio and container plants
  • Sub-tropical
  • Flower borders and beds
Pruning

Deadhead to promote continued flowering. Leave to dieback in autumn

Pests

Maybe susceptible to glasshouse red spider mite, slugs and caterpillars

Diseases

Canna can be susceptible to a virus

Get involved

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