Of horticultural origin, Delphinium × cultorum ‘Black Knight’, commonly known as perennial larkspur, is a tall delphinium notable for its high spikes of very dark blue-violet flowers with a dark centre. Its strongly upright habit and architectural flowering distinguish it from more compact border perennials. It is particularly well suited to creating vertical structure and flowering backdrops in sunny perennial borders.
|
Packaging
To find out more about our packaging, please visit our young plants' page available from the website header.
|
Available quantity | Dispo à partir de | Sold by | Desired quantity | |
|---|---|---|---|---|---|
|
Packaging
GT9
To find out more about our packaging, please visit our young plants' page available from the website header.
|
Available quantity 400 | Dispo à partir de Immédiat | Sold by min 10 |
|
|
Characteristics of Delphinium × cultorum ‘Black Knight’
Delphinium × cultorum ‘Black Knight’ is a vigorous herbaceous perennial forming a clump of deeply divided green leaves. In early summer, strong flowering stems rise above the foliage and carry long, densely packed spikes of very dark blue-violet flowers. At maturity, the plant reaches approximately 1.5 m in height and 60 cm in width. Its tall, slender silhouette adds a strong vertical accent to planting schemes. The foliage dies back in winter and regrows from the crown in spring. In exposed or windy positions, staking the flower spikes may be necessary to maintain an upright and tidy appearance.
How to use Delphinium × cultorum ‘Black Knight’?
Thanks to its height, Delphinium × cultorum ‘Black Knight’ is best positioned in the middle or back of perennial borders, where its upright flower spikes provide strong structure. Its deep blue-violet colour combines particularly well with white, pink or yellow flowers and grey foliage. It is suitable for perennial borders, English-style gardens and planting schemes intended for cut flowers. Planting in small groups increases the visual impact of the flowering display while making staking easier. It can also be grown in large containers, although this requires a generous volume of substrate, more regular watering and protection from winds that may damage or flatten the stems.
What are the best cultivation tips for Delphinium × cultorum ‘Black Knight’?
Plant Delphinium × cultorum ‘Black Knight’ in full sun or light partial shade, in deep, fertile, moisture-retentive but well-drained soil. Allow approximately 50 to 60 cm between plants. Prepare the soil thoroughly before planting and incorporate well-decomposed organic matter where needed. Maintain regular soil moisture during active growth and flowering, while avoiding prolonged waterlogging. An application of compost or a suitable perennial fertiliser in spring supports vigorous development. Remove faded flower spikes after the first flowering period; under favourable growing conditions, this can encourage a second flush of flowers later in summer.
