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Herbaceous Perennial

Delphinium Galahad Group

delphinium Galahad Group

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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Ultimate height

1.5–2.5 metres

Time to ultimate height

1 year

Ultimate spread

0.5–1 metres

Chalk

Sand

Loam

Moisture

Moist but well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

South–facing or East–facing or West–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Ranunculaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Potentially harmful: Humans/Pets: Harmful if eaten. Wear gloves and other protective equipment when handling. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
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. See staking: perennials and delphinium cultivation for further advice

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, slugs, snails and caterpillars

Diseases

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

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