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Herbaceous Perennial

Lupinus 'Blacksmith'
  • RHS Plants for pollinators

A vigorous, upright, clump-forming herbaceous perennial with palm-shaped mid-green leaves. Dense spikes of purple and white flowers appear late spring, flowering throughout the summer.

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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Loam
Sand
Moisture
Well–drained
pH
Acid, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Purple White Green
Summer Purple White Green
Autumn
Winter
Position
  • Full sun
  • Partial shade
Aspect

South–facing or East–facing or West–facing

Exposure
Sheltered
Hardiness
H5
Botanical details
Family
Fabaceae
Native to the UK
No
Foliage
Deciduous
Habit
Clump forming, Columnar upright
Potentially harmful
All parts, particularly the seeds, may cause severe discomfort if ingested. Wear gloves and other protective equipment when handling
Genus

Lupinus can be annuals, perennials or shrubs, with palmate leaves and showy terminal racemes of pea-like flowers

Name status

Accepted

How to grow

Cultivation

Grow in moderately fertile, humus-rich, light, moist but well-drained soil in full sun or light, dappled shade. May require support (see staking perennials)

Propagation

Propagate by basal stem cuttings

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

Deadhead to encourage a second flush of flowers

Pests

May be susceptible to slugs and lupin aphid

Diseases

May be susceptible to powdery mildews, rots, a leaf spot and a virus

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