Delphinium Black Knight Group Delphinium elatum 'Black Knight' 5-10 pot P9

Size: Potmaat leidend

5-10cm

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Pot 9x9 cm (P9)

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Benefits according to our specialist

Attracts bees
Rich flowering
Low maintenance

Plant features
Description
Planting and care
Packaging and shipping

Genus
Delphinium (view all varieties)

Root type
Pot

Pot size
9x9 cm (P9)

Flowering months
June, July, August

Leaf colour
Blue, Purple

Possibilities
Border, Group planting, Solitary

Soil type
All soil types, well-drained

Positioning
Semi-shade, Sun

Winter hardiness
-15,0°C / -9,4°C, USDA zone 7b/8a

Fruit-bearing plants
No

Water needs
Average water

Number of plants per m²
6

Evergreen plants
No

Leaf colour
Green

Fragrant plants
No

Growth habit
Upright growth habit

Height at time of delivery excluding pot/clod
5-10

Mature height (cm)
150

Art. no.
1000355

Description

Delphinium elatum 'Black Knight' | Delphinium Black Knight Group

The majestic Delphinium elatum 'Black Knight' offers a touch of drama to any garden with its tall spires of deep blue and purple flowers. As a proud member of the Delphinium Black Knight Group, it is renowned for its striking blooms and stately presence. This regal species promises to elevate the visual appeal of your landscape with its commanding height and vibrant colors.

Key Features

The Delphinium boasts an impressive height of up to 1.5 meters, making it a perfect backdrop for garden borders and group plantings.
With a preference for well-drained soil and a love for sunny to partially shaded locations, 'Black Knight' is adaptable to a variety of garden settings.
Its upright growth habit ensures that the plant maintains a neat and tidy appearance without the need for pruning.
Although not evergreen, the foliage of 'Black Knight' remains a lush green throughout the growing seasons, providing a constant backdrop for the plant's summertime floral display.

Tips

To propagate the Delphinium elatum 'Black Knight', softwood cuttings can be taken in the spring and early summer. Simply snip off the flexible tips of new shoots for rooting.
Multiplication by division not only yields more plants but also invigorates the parent plant. It is best to undertake this process during the cooler months of spring or autumn.
Ensure an average watering regime for the 'Black Knight'; it thrives with consistent moisture but does not tolerate drought well.
Despite its hardy nature, in areas with high winds, it may require staking to protect its statuesque stems from breaking.
Lastly, be mindful that although 'Black Knight' does not demand frequent pruning, deadheading spent flowers can encourage a second blooming and helps to maintain the plant's vigor.

Ideal placement of a Delphinium elatum 'Black Knight'

For optimal growth, Delphinium elatum 'Black Knight' should be situated in a location that receives full sun to partial shade. This ensures the most vibrant display of its striking blue and purple blooms during the summer months. It is adaptable to various soil conditions, provided the soil is well-drained to prevent waterlogging, which could be detrimental. An area that allows for its upright growth habit to reach its full potential, up to 1.5 meters, without obstruction is ideal. Adequate space should also be considered for its healthy development when used in borders or group plantings.

How do I plant a Delphinium elatum 'Black Knight'?

Planting Delphinium elatum 'Black Knight' requires selecting a location that offers full sun to partial shade and ensuring that the soil is well-drained to accommodate its needs. When planting these pot-grown specimens, space them adequately to allow for their upright growth habit and eventual height of up to 1.5 meters. Water the plants evenly following planting to encourage establishment. It is best to undertake planting during cooler parts of the day to minimize stress on the plants, promoting a seamless transition into their new environment.

Pruning a Delphinium elatum 'Black Knight'

Delphinium elatum 'Black Knight' thrives with minimal pruning. After the initial flowering peak, cutting back the spent flower stalks can encourage a second bloom in late summer. As autumn approaches and the plant begins to die back, one can trim the stems down to the ground level to maintain tidy garden beds and prepare for winter dormancy. While the species is deciduous, removing old growth at the end of the season allows for a vigorous return in spring, replete with the plant's stately blue and purple spires.

Watering a Delphinium elatum 'Black Knight'

To ensure the health and vigor of Delphinium pacific 'Black Knight', consistent moisture is paramount, particularly during the active growing season. This species thrives with an average amount of water, requiring attention especially in periods of dry weather. It is crucial to avoid waterlogging by ensuring good drainage in the soil, as this could adversely affect the plant. When watering, focus on the base to minimize wetting the foliage, which could lead to issues with the leaves. Regular watering promotes lush, green growth and assists in maintaining the striking blue and purple blooms for which this Delphinium is renowned.

Fertilising a Delphinium elatum 'Black Knight'

To ensure the Delphinium elatum 'Black Knight' thrives, a fertilization regimen is vital. Given its preference for well-drained soils and a full sun to partial shade location, feeding should be timed to coincide with key growth periods. It is recommended to apply a balanced, slow-release fertilizer early in the spring to kickstart the growing season. A second application might be beneficial during the early summer months to sustain the plant's energy needs for producing its striking blue and purple blooms. Care should be taken to follow the manufacturer's instructions, providing the plant with an appropriate amount of nutrients without over-fertilization, which can lead to excess foliage at the expense of flowers. Regular fertilization will support the plant's upright growth habit and contribute to its eventual impressive height of 1.5 meters.

The characteristics of a Delphinium elatum 'Black Knight'

Delphinium elatum 'Black Knight' thrives when supported with stakes, as its tall spikes of deep violet flowers can reach skyward with vigour. To maximize blooming potential, deadheading spent flowers encourages a second flush of blooms later in the season. This cultivar can also be propagated by basal cuttings in spring, offering gardeners a satisfying way to multiply their striking displays. Rich, well-draining soil will further enhance the plant's majestic presence in any garden setting.

Separating/dividing a Delphinium elatum 'Black Knight'

To encourage robust growth and maintain the health of Delphinium elatum 'Black Knight', division is recommended. This procedure rejuvenates the plant and enhances its vigour. Ideally, division should be carried out during the cooler periods of spring or autumn. Carefully lift the plant from the soil, ensuring to keep the root system intact. Once removed, the clump can be divided into smaller sections. Make sure each new division has a portion of the root system and several shoots. These divisions can then be replanted into well-drained soil, positioned to allow for their upright growth habit and potential height of 1.5 meters.

What will be the height of Delphinium elatum 'Black Knight'?

Delphinium elatum 'Black Knight' typically grows to a height ranging from 1.5 to 2.5 meters when fully mature.

What will be the width of Delphinium elatum 'Black Knight'?

Delphinium elatum 'Black Knight' can achieve a final spread ranging from 50 centimeters to 1 meter.

Which soil type is most suitable for the Delphinium elatum 'Black Knight'?

Delphinium elatum 'Black Knight' is adaptable to various soil types, but it thrives best in well-drained soil. Ensuring proper drainage will support the optimal growth and development of this particular plant.

What is the ideal positioning for the Delphinium elatum 'Black Knight'?

The ideal location for Delphinium elatum 'Black Knight' is a place where it can receive ample sunlight as well as partial shade. This plant flourishes in areas where it can bask in the sun's rays, while also benefiting from some protection provided by partial shade.

What is the flowering colour of the Delphinium elatum 'Black Knight'?

The blossoms of Delphinium elatum 'Black Knight' display a captivating blend of blue and purple hues, creating a striking visual impact in any garden setting.

Is the Delphinium elatum 'Black Knight' hardy?

Certainly, Delphinium elatum 'Black Knight' is considered winter hardy. It can endure temperatures as low as -15.0°C to -9.4°C, falling within the USDA hardiness zones 7b to 8a. This indicates that the Delphinium elatum 'Black Knight' is well-suited for withstanding winter conditions in these specific hardiness zones.

Is the Delphinium elatum 'Black Knight' evergreen?

Delphinium elatum 'Black Knight' is not an evergreen plant. This means that it goes through a seasonal cycle of losing its leaves and growing new ones.

What is the growth strength of the Delphinium elatum 'Black Knight'?

Delphinium elatum 'Black Knight' is known for its moderate growth, typically taking 2 to 5 years to reach its ultimate height. This suggests that it is a plant that steadily progresses in height over a few years, ensuring a well-established and robust growth pattern.

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