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Caryopteris x clandonensis Dark Knight - Bluebeard

Caryopteris x clandonensis Dark Knight
Bluebeard, Blue Spirea, Blue Mist Shrub

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A vigorous bush, ideal for a natural and wild garden. Its late summer dark blue-violet flowering attracts butterflies and other pollinating insects. It has many advantages: easy to grow, resistant to cold, drought, and diseases. Don't hesitate to adopt it in flower beds, borders, or even in pots.
Flower size
3 cm
Height at maturity
1.20 m
Spread at maturity
1 m
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, September
Recommended planting time March to May, September to November
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Flowering time August to September
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Description

The Caryopteris 'Dark Knight' is truly the ideal plant for a natural and wild garden. Its late flowering (late summer - early autumn) is a deep dark violet-blue and slightly fragrant and melliferous. It attracts butterflies and other pollinating insects. Its deciduous leaves are green with a silvery underside and aromatic when crushed. This vigorous small bush has many advantages. Easy to grow, it is resistant to cold and drought (once well established) and to diseases. Plant it in a sunny spot in well-drained soil.

Caryopteriss are small bushes from the Verbenaceae family, native to East Asia, where they grow in forests and on dry and hot slopes of the Himalayas. Caryopteris x clandonensis is a hybrid between C. incana and C. mongolica, which is hardier. This hybrid has given rise to many cultivars, most often with blue flowers, like 'Dark Knight', and more rarely with pink flowers, like 'Stephi'.
The Caryopteris x clandonensis 'Dark Knight' is a compact and rounded small bush that does not exceed 1.2 m in height. Its lance-shaped and slightly toothed leaves are green with a silvery underside. They are aromatic when crushed. In August-September, it is covered with small axillary and terminal clusters of small tubular flowers in a magnificent deep violet-blue color. Slightly fragrant, they are also melliferous and nectariferous and attract butterflies and pollinating insects like a magnet. Cut a few branches with buds to enhance your late summer country bouquets.

The 'Dark Knight' Bluebeard naturally finds its place in a flower bed, a border, or a rock garden, in the heart of a natural and wild garden or even an English garden. It can also be planted in a pot on a terrace. Surround it well, as in winter, once its flowering is over and its foliage has fallen, it tends to be forgotten. Pair it with shrubs with colourful autumn foliage like Euonymus alatus 'Compactus', or with golden evergreen foliage like Euonymus japonicus 'Aureus', or even with a rock garden conifer with bluish foliage, Juniperus horizontalis 'Blue Chip'. As for perennials, consider Verbena bonariensis or autumn asters. Yellow-flowered plants are also good companions. Then choose Potentilla fruticosa 'Elizabeth' or Echinacea 'Chiquita'.

Caryopteris x clandonensis Dark Knight - Bluebeard in pictures

Caryopteris x clandonensis Dark Knight - Bluebeard (Flowering) Flowering

Plant habit

Height at maturity 1.20 m
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour blue
Flowering time August to September
Inflorescence Cyme
Flower size 3 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased
Foliage description Its lance-shaped leaves are aromatic when crushed.

Botanical data

Genus

Caryopteris

Species

x clandonensis

Cultivar

Dark Knight

Family

Verbenaceae

Other common names

Bluebeard, Blue Spirea, Blue Mist Shrub

Origin

Cultivar or hybrid

Product reference20337

Planting and care

Easy to grow and hardy, Caryopteris x clandonensis 'Dark Knight' thrives in sunny, sheltered positions. It tolerates all types of soil, even poor ones, as long as they are well-drained. Once established, it can withstand summer drought. 
In March-April, prune back all the flowering stems by half, or even by ⅔, to maintain a dense habit. After pruning, apply a generous layer of well-decomposed compost as mulch around the base of your caryopteris.
In winter, place a thick layer of dried leaves at the base of your shrub to protect it from the harshness of winter.
The blue spirea is not susceptible to many pests or diseases, except for mosaic virus, which causes yellowish spots on the leaves. In this case, the only remedy is drastic: remove the plant.

Planting period

Best planting time March, September
Recommended planting time March to May, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Free-standing, Container, Slope
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Very well-drained, deep.

Care

Pruning instructions Carry out a severe pruning in spring, cutting back all the branches by half or even two-thirds.
Pruning Pruning recommended once a year
Pruning time March to April
Soil moisture Dry soil, Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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