Overview
Dianella caerulea 'Caspar Blue' is a bushy herbaceous perennial in the genus Dianella, part of the Asphodelaceae family, with evergreen foliage. Dianella caerulea 'Caspar Blue' grows best in full sun and partial shade, and tolerates loam and sand soils and acid and neutral pH. Its UK hardiness is rated H3. Suggested uses include coastal, cottage and informal garden, city and courtyard gardens, patio and container plants and flower borders and beds.
About
Dianella caerulea 'Caspar Blue' is a bushy, evergreen herbaceous perennial belonging to the genus Dianella, known for its stiff, sword-like foliage. This cultivar thrives in fertile, well-drained loam or sandy soils with an acid to neutral pH and prefers full sun to partial shade in sheltered, south-, west-, or east-facing aspects. It produces clusters of small, deep blue star-shaped flowers in spring and summer, followed by durable blue or purple berries. Suitable for coastal, cottage, city, and courtyard gardens, it can also be grown in patios, containers, flower borders, and beds.
Growing conditions
Best soil and position for Dianella
- Sunlight
- Full sun, Partial shade
- Soil type
- Loam, Sand
- Soil pH
- Acid, Neutral
- Soil moisture
- Well-drained
- Aspect
- South-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H3
Plant details
Dianella caerulea 'Caspar Blue' size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Bushy
- Foliage
- Evergreen
- Suggested uses
- Coastal, Cottage and informal garden, City and courtyard gardens, Patio and container plants, Flower borders and beds
Care notes
Pruning and caring for Dianella caerulea 'Caspar Blue'
- Propagation
- Seed, Division
- Pest resistance
- Generally pest-free
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Dianella caerulea 'Caspar Blue'?
Dianella caerulea 'Caspar Blue' prefers full sun and partial shade. It suits sheltered positions.
What soil does Dianella caerulea 'Caspar Blue' need?
Dianella caerulea 'Caspar Blue' grows best in loam and sand soil. It prefers acid and neutral soil. Aim for soil that stays well-drained.
Is Dianella caerulea 'Caspar Blue' hardy in the UK?
Dianella caerulea 'Caspar Blue' has an RHS hardiness rating of H3, meaning it is half-hardy, tolerating -5 to 1°C, and may need winter protection in colder areas.
How do I propagate Dianella caerulea 'Caspar Blue'?
Seed, Division.
More in the Dianella genus
- Dianella caerulea 'Becca'
- Dianella intermediaTurutu
- Dianella nigraNew Zealand blueberry
- Dianella revoluta
- Dianella tasmanicaTasman flax-lily
- Dianella tasmanica 'Variegata' (v)Tasman flax-lily 'Variegata'
- Dianella caerula 'Proquest D3'PBR
- Dianella ensifoliaumbrella dracaena