Not the plant you're looking for? Search over 300,000 plants
Conservatory GreenhouseBogsHerbaceous Perennial

Canna 'Ra'
  • RHS AGM

water canna 'Ra'

'Ra' grows into a spreading clump 1.8m tall, with blue-green leaves and clear yellow flowers from mid summer to autumn

Buy this plant
Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
1–2 years
Ultimate spread
0.5–1 metres
Growing conditions
Loam
Moisture
Poorly–drained
pH
Acid
Colour & scent
StemFlowerFoliageFruit
Spring Blue Green
Summer Yellow Blue Green
Autumn Yellow Blue Green
Winter
Position
  • Full sun
  • Partial shade
Aspect

West–facing or South–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

Propagation

Propagate by seed or division

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

Deadhead regularly to promote flowering

Pests

Glasshouse red spider mite, aphids, slugs and caterpillars may occur

Diseases

Canna can be infected with a virus

My Garden

Your free RHS gardening coach

Keep track of your plants with reminders & care tips – all to help you grow successfully

My plants
My calendar

My plants

My calendar

My ideas
Manage membership

My ideas

My advice

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.