Overview
Delphinium 'Royal Blue' is a clump-forming, upright herbaceous perennial in the genus Delphinium, part of the Ranunculaceae family, with divided green leaves foliage. Delphinium 'Royal Blue' grows best in full sun, and tolerates loam soils and neutral pH. Its UK hardiness is rated H5. Suggested uses include beds, borders and cut flowers.
About
Delphinium 'Royal Blue' is a clump-forming, upright herbaceous perennial belonging to the Ranunculaceae family. Like other Delphiniums, it features divided green leaves and prominent bowl-shaped flowers arranged in spikes. This cultivar thrives in fertile, moist but well-drained loam soil with a neutral pH, ideally in full sun and sheltered from wind. Suitable for beds, borders, and cut flowers, it is hardy to UK zone H5 and is best grown in south-, west-, or east-facing aspects. Propagation is by basal cuttings in early spring, with mulching recommended at this time.
About the genus
Delphinium is a genus of about 300 species of annual and perennial flowering plants in the family Ranunculaceae, native throughout the Northern Hemisphere and also on the high mountains of tropical Africa. The genus was erected by Carl Linnaeus.
Wikipedia contributors, "Delphinium", CC BY-SA 4.0 — Delphinium
Growing conditions
Best soil and position for Delphinium
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H5
Plant details
Delphinium 'Royal Blue' size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Clump-forming, upright
- Foliage
- Divided green leaves
- Suggested uses
- Beds, borders, cut flowers
Care notes
Pruning and caring for Delphinium 'Royal Blue'
- Propagation
- Basal cuttings in early spring
- Pest resistance
- Aphids, earwigs, delphinium leaf miner, delphinium moth caterpillars, slugs, snails, caterpillars
- Disease resistance
- Powdery mildews, delphinium black blotch, crown rot, viruses
Frequently asked questions
Where is the best place to plant Delphinium 'Royal Blue'?
Delphinium 'Royal Blue' prefers full sun. It suits sheltered positions.
What soil does Delphinium 'Royal Blue' need?
Delphinium 'Royal Blue' grows best in loam soil. It prefers neutral soil. Aim for soil that stays moist but well-drained.
Is Delphinium 'Royal Blue' hardy in the UK?
Delphinium 'Royal Blue' has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.
How do I propagate Delphinium 'Royal Blue'?
Basal cuttings in early spring.
More in the Delphinium genus
- Delphinium 'Nora Ferguson'Larkspur
- Delphinium Hybrids, BelladonnaLarkspur
- Delphinium cheilanthumgarland larkspur
- Delphinium grandiflorum 'Hunky Dory White'Siberian Larkspur
- Delphinium requieniiLarkspur
- Delphinium tatsienenseLarkspur
- Delphinium × ruysii 'Pink Sensation'delphinium 'Pink Sensation'
- Delphinium 'Centurion White' (Centurion Series)delphinium 'Centurion White'