Overview
Trachelium caeruleum 'Black Knight' is a bushy bedding in the genus Trachelium, part of the Campanulaceae family, with deciduous foliage. Trachelium caeruleum 'Black Knight' grows best in full sun, and tolerates loam and sand soils and any pH. Its UK hardiness is rated H2. Suggested uses include city and courtyard gardens, patio and container plants, cottage and informal garden, flower borders and beds, cut flowers and wall side borders.
About
Trachelium caeruleum 'Black Knight' is a bushy, deciduous cultivar of the Trachelium genus, which comprises perennial plants with small leaves and tubular flowers that bloom in summer. This cultivar thrives in full sun and suits both west- and east-facing aspects, tolerating exposed or sheltered conditions. It prefers fertile, moist but well-drained loam or sandy soils across a range of pH levels. Hardy to UK zone H2, 'Black Knight' is suitable for city gardens, patios, flower borders, and as cut flowers, offering seasonal interest in spring and summer.
Growing conditions
Best soil and position for Trachelium
- Sunlight
- Full sun
- Soil type
- Loam, Sand
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- West-facing, East-facing
- Exposure
- Exposed, Sheltered
- UK hardiness
- H2
Plant details
Trachelium caeruleum 'Black Knight' size, habit and characteristics
- Plant type
- Bedding, Conservatory Greenhouse, Herbaceous Perennial, Annual Biennial
- Habit
- Bushy
- Foliage
- Deciduous
- Suggested uses
- City and courtyard gardens, Patio and container plants, Cottage and informal garden, Flower borders and beds, Cut flowers, Wall side borders
Care notes
Pruning and caring for Trachelium caeruleum 'Black Knight'
- Propagation
- Seed sown at 16°C in spring
- Pest resistance
- Generally pest-free
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Trachelium caeruleum 'Black Knight'?
Trachelium caeruleum 'Black Knight' prefers full sun. It suits exposed and sheltered positions.
What soil does Trachelium caeruleum 'Black Knight' need?
Trachelium caeruleum 'Black Knight' grows best in loam and sand soil. It is happy in soil of any pH. Aim for soil that stays moist but well-drained.
Is Trachelium caeruleum 'Black Knight' hardy in the UK?
Trachelium caeruleum 'Black Knight' has an RHS hardiness rating of H2, meaning it is tender, tolerating 1–5°C, and needs frost-free protection over winter.
How do I propagate Trachelium caeruleum 'Black Knight'?
Seed sown at 16°C in spring.
