Delphinium ‘Black Knight’ – Larkspur (1L Pot)
Delphinium ‘Black Knight’ is a dramatic tall flowering perennial prized for its striking spires of deep violet-blue blooms. A classic feature of cottage gardens and herbaceous borders, this elegant delphinium brings height, rich colour, and architectural impact to summer planting.
Key Features
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Produces tall, majestic flower spikes reaching 1.5–2m in height
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Stunning deep violet-blue flowers that create a bold garden statement
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Ideal for cottage gardens, herbaceous borders, and traditional planting schemes
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Attractive to pollinators, including bees and butterflies
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Excellent cut flower variety for dramatic floral arrangements
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Can produce a second flush of flowers if stems are cut back after blooming
Product Description
Delphinium ‘Black Knight’ is one of the most admired varieties of delphinium, known for its richly coloured, deep violet-blue flower spikes that rise elegantly above a mound of deeply cut grey-green foliage. Flowering from June through to July, the densely packed blooms create a striking vertical display in summer borders.
This classic perennial is particularly effective when planted in bold groups at the back of mixed or herbaceous borders, where its height and strong colour can be fully appreciated. The dramatic blue tones pair beautifully with creamy white, pastel, or soft pink flowering perennials, creating a timeless cottage garden palette.
Although the main flowering period is relatively short, cutting back spent flower stems promptly can encourage a second flush of blooms later in the season, extending the display and adding further interest to the garden.
Specifications
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Botanical Name: Delphinium ‘Black Knight’
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Common Name: Larkspur
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Plant Type: Herbaceous perennial
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Pot Size: 1L pot
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Mature Height: 1.5–2.0m
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Mature Spread: 0.5–1.0m
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Flower Colour: Deep violet-blue
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Flowering Period: June to July (summer)
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Foliage: Deciduous, grey-green deeply cut leaves
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Growth Rate: Average
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Hardiness: Fully hardy
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Position: Full sun
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Soil Moisture: Moist but well-drained or well-drained soil
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Soil Type: Chalk, loam or sandy soils
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Soil pH: Acid, neutral or alkaline
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Garden Use: Borders, cottage gardens, cut flower gardens
Care Tips
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Plant in fertile, well-drained soil in a sunny position for best flowering
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Choose a sheltered location to protect tall stems from strong winds
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Stake stems early before the flower spikes develop
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Protect young shoots from slugs and snails in spring
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Deadhead and cut back spent stems to encourage a second flush of blooms
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Water during dry periods to keep the soil moist but not waterlogged
Add Delphinium ‘Black Knight’ to your garden for dramatic height, intense summer colour, and timeless cottage garden charm—a perfect choice for creating an eye-catching focal point in sunny borders.
