Overview
Delphinium elatum 'Sweethearts' (New Millennium Series) is a clump forming, columnar upright herbaceous perennial in the genus Delphinium, part of the Ranunculaceae family, with deciduous foliage. It typically grows around 1.5-2.5 metres tall and 0.5-1 metres wide, reaching full size in around 2-5 years. Delphinium elatum 'Sweethearts' (New Millennium Series) grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H6. Suggested uses include beds, borders and cut flowers.
About
Delphinium elatum 'Sweethearts' (New Millennium Series) is a herbaceous perennial in the Ranunculaceae family, known for its clump-forming, columnar upright habit. This deciduous plant grows to a height of 1.5 to 2.5 metres with a spread of 0.5 to 1 metre, reaching full height within 2 to 5 years. It thrives in full sun on south-, west-, or east-facing aspects, preferring sheltered positions. Suitable for a range of soil types including chalk, clay, loam, and sand, it favours moist but well-drained or well-drained soils with acid, alkaline, or neutral pH. Its season of interest is summer.
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
- Chalk, Clay, Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained, Well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H6
Plant details
Delphinium elatum 'Sweethearts' (New Millennium Series) size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Clump forming, Columnar upright
- Foliage
- Deciduous
- Height
- 1.5-2.5 metres
- Spread
- 0.5-1 metres
- Time to full height
- 2-5 years
- Suggested uses
- Beds, borders, cut flowers
Care notes
Pruning and caring for Delphinium elatum 'Sweethearts' (New Millennium Series)
- Propagation
- Basal softwood cuttings, division
- Pest resistance
- Aphids, Earwigs, Delphinium leaf miner, Delphinium moth caterpillars, Slugs, Snails, Caterpillars
- Disease resistance
- Powdery mildews, Delphinium black blotch, Grey moulds, Sclerotinia disease, Crown rot, Cucumber mosaic virus
Frequently asked questions
Where is the best place to plant Delphinium elatum 'Sweethearts' (New Millennium Series)?
Delphinium elatum 'Sweethearts' (New Millennium Series) prefers full sun. It suits sheltered positions.
What soil does Delphinium elatum 'Sweethearts' (New Millennium Series) need?
Delphinium elatum 'Sweethearts' (New Millennium Series) is adaptable and grows happily in most soil types, including chalk, clay, loam and sand. It is happy in soil of any pH. Aim for soil that stays moist but well-drained to well-drained.
How big does Delphinium elatum 'Sweethearts' (New Millennium Series) grow?
Delphinium elatum 'Sweethearts' (New Millennium Series) reaches a height of 1.5-2.5 metres and a spread of 0.5-1 metres. It takes around 2-5 years to reach full size.
Is Delphinium elatum 'Sweethearts' (New Millennium Series) hardy in the UK?
Delphinium elatum 'Sweethearts' (New Millennium Series) has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.
How do I propagate Delphinium elatum 'Sweethearts' (New Millennium Series)?
Basal softwood cuttings, division.
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'