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Climber Wall ShrubConservatory GreenhouseShrubs

Lycianthes rantonnetii
  • RHS AGM

blue potato bush

L. rantonnetii is a lax, evergreen shrub producing clusters of lightly fragrant, purple-blue, funnel-shaped flowers in summer and autumn. These are followed by red berries

Synonyms
Solanum rantonnetii
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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
2–5 years
Ultimate spread
1.5–2.5 metres
Growing conditions
Loam
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Blue Green
Autumn Blue Green Red
Winter Green
Position
  • Full sun
Aspect

South–facing or West–facing

Exposure
Sheltered
Hardiness
H3
Botanical details
Family
Solanaceae
Native to the UK
No
Foliage
Evergreen
Habit
Bushy
Potentially harmful
All parts can cause severe discomfort if eaten. Wear gloves and wash hands after handling
Name status

Correct

Plant range
Paraguay, Argentina

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How to grow

Cultivation

May survive as a wall-shrub in very mild areas, or grow as a standard in a pot and take under cover for winter. Otherwise grow in a cool greenhouse or conservatory with shade from the brightest sun and moderate humidity. Plants will require support

Propagation

Propagate by seed, or semi-ripe cuttings taken in summer or early autumn and rooted with gentle bottom heat

Suggested planting locations and garden types
  • City and courtyard gardens
  • Patio and container plants
  • Mediterranean climate plants
  • Wall side borders
Pruning

Pruning group 9 if freestanding or pruning group 12 as a wall shrub

Pests

Prone to aphids and glasshouse red spider mites whilst under glass

Diseases

Prone to grey moulds under glass

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