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Herbaceous Perennial

Delphinium Galahad Group
  • RHS Plants for pollinators

A short-lived herbaceous perennial, often grown as an annual or biennial plant that produce spikes up to 1.8m tall densely-packed with large, semi-double white flowers throughout early and midsummer

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Size
Ultimate height
1.5–2.5 metres
Time to ultimate height
1 year
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Sand
Loam
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer White Green
Autumn Green
Winter
Position
  • Full sun
Aspect

South–facing or East–facing or West–facing

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

Delphinium can be annuals, biennials or perennials, with palmately lobed basal leaves and showy bowl-shaped flowers in spikes, racemes or panicles

Name status

Unresolved

How to grow

Cultivation

Grow in a fertile, well-drained but moisture-retentive soil in full sun; shelter from strong winds and provide stakes or other supports. PLease see our webpage on delphinium cultivation

Propagation

Propagate by seed, basal softwood cuttings or by division

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds
  • Wall side borders
Pruning

Deadhead spent flower spikes. After flowering, cut down all growth to ground level. If fed and watered well, a second flush of flowers may be produced in autumn

Pests

May be susceptible to aphids, earwigs, delphinium leaf miner, delphinium moth caterpillars and slugs and snails

Diseases

May be susceptible to powdery mildews, delphinium black blotch, grey moulds, sclerotinia disease, crown rot and cucumber mosiac virus

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