Overview
Delphinium 'Astolat' is a columnar upright perennial in the genus Delphinium, part of the Ranunculaceae family, with deciduous foliage. Delphinium 'Astolat' grows best in full sun, and tolerates well-drained and fertile soils and neutral to slightly alkaline pH. Its UK hardiness is rated H5. Suggested uses include borders, cottage gardens and cut flowers.
About
Delphinium 'Astolat' is a perennial cultivar within the Delphinium genus, known for its tall flower spikes. Like other delphiniums, it thrives in full sun to partial shade and prefers a sheltered aspect with well-drained, fertile soil that is neutral to slightly alkaline and kept moist. This cultivar is hardy in the UK (H5) and is suitable for borders, cottage gardens, and as cut flowers. To maintain its growth, staking is recommended, and cutting back after flowering encourages fresh growth. It is important to note that Delphinium 'Astolat' is toxic.
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
- well-drained, fertile
- Soil pH
- neutral to slightly alkaline
- Soil moisture
- moist
- Aspect
- sheltered
- Exposure
- full sun to partial shade
- UK hardiness
- H5
Plant details
Delphinium 'Astolat' size, habit and characteristics
- Plant type
- perennial
- Habit
- Columnar upright
- Foliage
- Deciduous
- Suggested uses
- borders, cottage gardens, cut flowers
- Toxicity
- toxic
Care notes
Pruning and caring for Delphinium 'Astolat'
- Cultivation
- Prefers rich, well-drained soil with consistent moisture; staking recommended to support tall flower spikes.
- Pruning
- Cut back after flowering to encourage fresh growth.
- Propagation
- seed, division
- Pest resistance
- Aphids, Slugs, Snails, Leaf miners, Caterpillars
- Disease resistance
- Powdery mildew, Delphinium black blotch, Crown rot, Viruses
Frequently asked questions
How do I grow Delphinium 'Astolat'?
Prefers rich, well-drained soil with consistent moisture; staking recommended to support tall flower spikes.
Where is the best place to plant Delphinium 'Astolat'?
Delphinium 'Astolat' prefers full sun. It suits full sun to partial shade positions.
What soil does Delphinium 'Astolat' need?
Delphinium 'Astolat' grows best in well-drained and fertile soil. It prefers neutral to slightly alkaline soil. Aim for soil that stays moist.
How do I prune Delphinium 'Astolat'?
Cut back after flowering to encourage fresh growth.
Is Delphinium 'Astolat' hardy in the UK?
Delphinium 'Astolat' 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 'Astolat'?
Seed, division.
Is Delphinium 'Astolat' toxic?
Toxic.
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'