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Delphinium Tall Black Knight - Larkspur seeds

Delphinium x cultorum Tall Black Knight
Larkspur, Hybrid Larkspur

3,4/5
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2 reviews

Hello, out of a theoretical capacity of 100 seeds, 6 have germinated, which is a success rate of 6%! Disappointing!

Christophe, 17/09/2019

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This plant carries a 6 months recovery warranty

More information

This delphinium is a large perennial variety with tall sturdy spikes covered with dark blue-violet flowers whose centre is adorned with a large black collar in summer. Magnificent and spectacular in the back of a border. These plants thrive in the sun in rich, deep, well-drained soil.
Flower size
30 cm
Height at maturity
1.35 m
Exposure
Sun
Annual / Perennial
Perennial
Germination time (days)
24 days
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Sowing period February to April
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Flowering time June to September
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Description

Delphinium Tall Black Knight is a tall perennial variety with large sturdy spikes covered with dark violet-blue flowers with a black collar at the centre in summer. Magnificent and spectacular in the back of borders, in containers, in pots near the house, or as a cut flower. These larkspurs thrive in sunny, rich, deep, and well-drained soils.

 

Delphinium 'Tall Black Knight' is one of many hybrids obtained through the cross-breeding of D. elatum, which gave rise, among others, to the famous "Pacific Giant" series. It is a large herbaceous perennial plant with a short lifespan but rapid growth. It forms a clump of deeply cut palmate, tender green leaves, from which floral stems ranging from 1.20m (4ft) to 1.50m (5ft) high emerge in summer. The flowering period lasts from June to September and is highly visited by pollinating insects. The flowers are single, cup-shaped and gathered on tall and sturdy spikes. They have intense violet-blue petals, surrounding a large black collar, called 'fly' or 'bee'. The plant develops from a woody rhizome that vertically penetrates the soil.

 

The characteristic silhouette of Delphiniums always adds volume, height and charm to perennial plant beds. They are also good companions for moss or gallica roses, with which they can form charming and romantic compositions. Another beautiful combination can be made with soft orange daylilies and baby's breath Rosenschleier. This variety is also suitable for pots and its flowers hold up well when cut.

Flowering

Flower colour blue
Flowering time June to September
Inflorescence Spike
Flower size 30 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour green

Plant habit

Height at maturity 1.35 m
Spread at maturity 50 cm
Growth rate normal

Safety measures

Potential risks Plant may be toxic if swallowed

Botanical data

Genus

Delphinium

Species

x cultorum

Cultivar

Tall Black Knight

Family

Ranunculaceae

Other common names

Larkspur, Hybrid Larkspur

Origin

Cultivar or hybrid

Other Delphinium seeds

  1. 15
    €4.50 Seeds

Planting and care

Sow Delphinium seeds from February to June in a good quality, well-draining soil and lightly cover the seeds with a pinch of compost or vermiculite. Place the seed tray in a propagator at a temperature of 10-13°C (50-55.4°F), or seal it in a transparent polythene bag and place it in a dark location until germination, which takes 1 to 3 months. Keep the compost moist but not wet.

When the seedlings are large enough to handle, transplant them into 8 cm (3in) pots and move the Delphinium plants to cooler conditions. Once all risk of frost has passed, gradually acclimate the young plants to outdoor conditions for 7 to 10 days before planting them outside in the open ground. Plant the Delphiniums at a distance of 45cm (18in) in moist, fertile, well-worked and well-drained soil. Delphiniums dislike stagnant moisture. Choose a sunny position sheltered from strong winds. Protect the young delphiniums from attacks by slugs and snails.

Sowing period

Sowing period February to April
Germination time (days) 24 days

Intended location

Suitable for Meadow
Type of use Border, Back of border, Container
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Acidic, Neutral
Soil moisture Moist soil, rich, worked deeply soil
3,4/5
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Flower seeds

  1. 12
    €5.90 Tin

    Available in 2 sizes

  2. Out of stock
    €6.50 Seeds

  3. 12
    €6.50 Seeds

  4. Out of stock
    €5.90 Tin

    Available in 2 sizes

  5. 77
    €2.50 Seeds

  6. 23
    €4.50 Seeds

  7. Out of stock
    €1.90 Seeds

  8. 23
    €2.40 Seeds

  9. 18
    €1.60 Seeds

  10. 68
    €2.50 Seeds

  11. 222
    €6.50 Seeds

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