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Streptocarpus 'Harlequin Blue'PBR
  • RHS AGM

Cape primrose 'Harlequin Blue'

'Harlequin Blue' is a compact cultivar with short flower stems to 4.4cm and neat leaves. Flowers are distinctive with yellow lower lobes, which hold their colour well, soft blue upper lobes and very dark purple lines in the throat defining the extent of the two colours. Winner of the RHS Chelsea Flower Show Plant of the Year in 2010. Shortlisted for Chelsea Plant of the Centenary in 2013 for the decade 2003-2012

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Size
Ultimate height
0.1–0.5 metres
Time to ultimate height
2–5 years
Ultimate spread
0.1–0.5 metres
Growing conditions
Chalk
Clay
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Blue Yellow Green
Summer Blue Yellow Green
Autumn Blue Yellow Green
Winter Green
Position
  • Partial shade
Aspect

South–facing or East–facing

Exposure
Sheltered
Hardiness
H1C
Botanical details
Family
Gesneriaceae
Native to the UK
No
Foliage
Evergreen
Habit
Clump forming
Genus

Streptocarpus can be annuals, perennials or subshrubs, with usually wrinkled, lance-shaped to rounded leaves and clusters of tubular to trumpet-shaped flowers with 5 spreading lobes, often borne throughout the year

Name status

Accepted

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How to grow

Cultivation

Grow as a houseplant in loamless potting compost on an east or west-facing windowsill, or grow in a temperate or warm greenhouse in bright filtered light with shade from hot sun. Water sparingly as compost dries in winter and in the growing season water freely allowing compost to dry out between waterings; feed fortnightly with a high-potassium fertiliser. See Streptocarpus cultivation

Propagation

Propagate by seed or leaf cuttings

Suggested planting locations and garden types
  • Patio and container plants
Pruning

No pruning required

Pests

May be attacked by glasshouse leafhoppers, mealybugs, thrips, vine weevil and tarsonemid mite

Diseases

Generally disease free

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