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Cornus kousa Couronne - Flowering Dogwood

Cornus kousa Couronne
Kousa Dogwood, Japanese Dogwood, Chinese Dogwood

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The beautiful young plant arrived in perfect condition, very well packaged and we planted it the next day. We hope everything will go well this winter. Good mulching to protect it and fingers crossed! Thank you.

Isabelle , 26/11/2023

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More information

A remarkable variety due to the very unusual shape of its compound flowers with white bracts curving downwards. The habit of this bush is original, much taller than wide, in the shape of a pagoda. The autumnal colours in shades of red-orange to purple further enhance the ornamental interest of this extraordinary Japanese cornus. It can withstand temperatures below -15°C (5°F) and adapts to any good garden soil, moist, neutral to acidic.
Flower size
10 cm
Height at maturity
3 m
Spread at maturity
1 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time May to June
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Description

The Cornus kousa 'Couronne' is a recent horticultural selection with multiple attractions. This Japanese Dogwood forms a medium-sized bush in the shape of a pagoda, taller than it is wide, whereas most other varieties tend to spread in width. Its flowering is also quite distinctive, with beautiful white curved bracts resembling an immaculate royal crown. Its beautiful foliage takes on warm autumn colours that create stunning scenes in the garden. Very hardy and less difficult to grow than its cousin, Cornus florida, this beautiful bush undoubtedly deserves to be planted more, especially since its dimensions are suitable even for smaller spaces.

The Dogwood belongs to the small family of Cornaceae, which, after several reclassifications, now includes only the genera Cornus and Alangium. In nature, Cornus kousa is a tree with small growth, or a large bush, native to Japan, China, and Korea. Its architectural silhouette, supported by staggered and horizontal branches, gives it a Japanese appearance. The botanical species has given rise to several horticultural varieties, the result of breeders' work.
'Couronne' is a recent creation with original characteristics. With relatively slow growth, the bush will reach 3m (10ft) in height, or slightly more, but rarely exceed 1m (3ft) in width. These unusual proportions and its pagoda-like habit give it a very interesting graphical aspect, well suited to contemporary, Japanese, or exotic style gardens. Its flowering, which appears in May and extends into June, is also very unique in its unprecedented form. The inflorescences are typically composed of a central cluster of small flowers, clustered together to form a sort of small greenish cone, vaguely resembling a blackberry. Four white bracts are inserted into it, each about 5 or 6cm (2in) long, which are mistakenly admired as flowers (they are transformed leaves). The novelty here lies in the downward curvature of the bracts, which appear to form the framework of a crown surmounted by the cluster, the latter reigning at the top like a diamond. Very floriferous, the bush offers a surprising spectacle that attracts all eyes in spring.
The flowers are followed by fruits measuring 2.5cm (1in) in diameter, red or orange in colour. The higher the summer temperatures, the more generous the fruiting. Conversely, if the summer is cold and humid, the flowering will be affected the following year... The foliage of this cultivar is quite similar to other varieties, with elliptical-shaped leaves and pointed tips. The veins are clearly visible and the surface of the leaf blade, a fairly dark green, is slightly shiny. In autumn, with the onset of cold weather, the leaves turn red, orange, purple and other warm ornamental shades.

The Cornus kousa 'Couronne' thrives in continental climates, with marked summers and winters, but performs well in milder areas too. In hot regions, it should be placed in a sheltered spot away from scorching sun, and everywhere, protected from strong winds. This Japanese Dogwood is particularly interesting for small gardens due to its narrow habit. It will be easy to find a place for it in a varied plant bed, alongside other ornamental plants with similar needs. The Chinese Azaleas will allow you to create sumptuous colour contrasts, especially the Azalea mollis Koster's Brilliant Red with its spring bouquets of orange-red trumpets. To extend the flowering season of your plant bed into early spring, treat yourself to the incredible Magnolia x soulangeana Megalonia, with gigantic rose-purple flowers up to 30cm (12in) in diameter in March-April. And for summer blooms, nothing beats the Hydrangeas available in an incredible range of colours and sizes. The varieties of Camellia sasanqua will offer you their romantic blooms late in the season and even during winter for some.

Plant habit

Height at maturity 3 m
Spread at maturity 1 m
Habit Flat
Growth rate slow

Flowering

Flower colour white
Flowering time May to June
Inflorescence Solitary
Flower size 10 cm
Fruit colour red

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Cornus

Species

kousa

Cultivar

Couronne

Family

Cornaceae

Other common names

Kousa Dogwood, Japanese Dogwood, Chinese Dogwood

Origin

Cultivar or hybrid

Product reference20166

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Planting and care

Originally from Japan, Korea and China, Cornus kousa bushes thrive in continental climates and temperate zones. The long, hot summers promote fruit ripening. This bush is quite hardy and can withstand frost of at least -15°C (5°F). It tolerates sunny exposures in areas with moderately hot summers. In hot regions, it should be planted in a location protected from scorching sun.

It appreciates deep, fertile, well-drained soils that are slightly acidic or neutral (although it is not a plant for heathland, which is too poor and dries out quickly). It greatly appreciates the thick humus of leafy undergrowth. It tolerates clay soils as long as it is protected from excessive moisture, especially in winter. Plant it in a deep hole lined with clay pebbles, coarse sand or gravel to ensure good drainage if necessary, in a very compact soil. Any good, balanced and loose garden soil suits it. At planting, provide it with compost and leaf mould. Mulching with pine bark will help maintain freshness in summer and promote soil acidity.

Pruning is not obligatory, but can be done at the end of winter to remove diseased or dead wood and crossing branches in order to maintain an attractive pagoda-like habit. During the first two years after planting, regular watering is necessary in summer, afterwards it can manage on its own.

Planting period

Best planting time March, October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Deep, well-drained, humus-rich.

Care

Pruning instructions Pruning is not necessary, but some branches can be shortened at the end of winter to accentuate the natural pagoda appearance. Dead wood and intersecting branches should also be removed to maintain an attractive habit.
Pruning Pruning recommended once a year
Pruning time March
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
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