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Delphinium 'Galileo' AGM

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© RHS

Characteristics

Plant type

Herbaceous Perennial

Habit

Bushy

Toxicity

All parts may cause severe discomfort if ingested

Resilience

Hardiness

H6 (hardy - very cold winter)

Colour

Flower

Blue in Summer

Foliage

Dark Green in Spring and Summer

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

delphinium 'Galileo'

Family

Ranunculaceae


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

'Galileo' is a perennial to 1.8m tall, with dark foliage and dense, tapering spikes of mid-blue semi-double flowers to 7cm across, in early summer

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing, West-facing or East-facing
  • Sheltered

Cultivation

Grow in a fertile, well-drained soil in full sun; shelter from strong winds and stake well. Apply a balanced liquid every couple of weeks in the growing season. For best flower spikes thin shoots when 7cm high to leave a minimum of 2-3 shoots on young plants and 5-7 shoots on established plants

Soil

  • Well-drained or Moist but well-drained
  • Acid, Alkaline or Neutral
  • Sand, Chalk or Loam

Propagation

Propagate by taking pencil thick basal cuttings in early spring

Suggested planting locations and garden types

City/Courtyard Gardens, Cottage/Informal Garden or Flower borders and beds


How to care

Pruning

Deadhead by cutting spent flower spikes back to small flowering side shoots. Cut down all growth to ground level after it has withered in autumn.

Pests

Prone to slugs, snails, leaf miners and caterpillars

Diseases

May be subject to powdery mildews, delphinium black blotch, crown rot and a virus