Japanese hornet - planting, pruning, cutting

Japanese hornet - planting, pruning, cutting

Corête du Japon, a solar shrub in spring!

The Japanese hornwort, this spring-flowering shrub, is one of the most common shrubs in ornamental gardens. There are a few varieties, with single or double flowers but always with deciduous leaves. The flowers are always more or less dark yellow. Shrubs with double flowers take their place in the garden more quickly because they suck a lot, the shrub then produces many branches carrying flowers that literally light up the garden with their yellow rays.

Botanical name:

• Kerria Japonica

Plant info:

• Cycle: Perennial
• Foliage: Lapsed
• Hardiness: Hardy (-20 ° C)
• Family: Rosaceae rosaceae
• Harbor : Erect tuft shrub
• Exhibition: Sun (beware of "hot" exposures)
• Ground : Rich and drained soil
• Sowing:
• Plantation: Fall or early spring
• Flowering: April to June (sometimes in September)
• Rooting: Roots
• Cultivation area: Up to zone 6 (see the France - Quebec hardiness map)
• Origin: China
• Honey plant: Yes
• Edible plant: No

Particularities of the Japanese horn:

• The shrub can reach 2m in height and wingspan.
• It quickly reaches its adult size.
• Single or double flowers
• Varieties with double flowers are very floriferous.
• Despite its bushy appearance, the stems of the corest do not branch, but emit many branches.

What advantages in the garden

• Very floriferous.
• Rapid growth.
• Easy to grow and maintain

Did you know ?

After shedding its leaves, its branches remain green, giving the Japanese hornet a beautiful appearance even during the long period of fall and winter.

Which exhibition for the Japanese horn?

• In very hot regions, favor partial shade.

What soil?

• Ordinary, rather fertile and fairly drained soil.
• Japanese corestus is easy in the garden and accepts almost any type of soil.

Method of multiplication of the Japanese corestus?

• Root cutting.

When to cut the roots?

• In the heart of winter December to February.

How to cut the corête du Japon?

The roots of Kerria Japonica grow deep to the surface, especially when the shrub has established itself well in the garden. On the periphery of the shrub, close to the surface, the roots develop which will produce the future branches. These are the ones you need to collect to produce your cuttings. And you will "see" it, there is no particular difficulty in making these cuttings.
This type of cuttings can also be used to cut raspberry or sumac.

1st step, clear the roots:

• With a spade fork, go under the peripheral roots,
• Gently move it up and down to loosen the roots from the soil.
• These roots are fine and provided with buds.

2nd step, take the roots:

• With a secateurs remove one or 2 roots.
• Then tamp the soil with your foot to restore the stump.

3rd step, preparation of a cutting crate:

• In a crate pierced or filled with earthen balls
• Place the substrate, special seedling potting soil and cutting, halfway up.
• With a small board, even out by tamping down the substrate.

4th step, placing the cuttings:

• Cut the roots into segments of 3 to 8 cm,
These segments must be carriers ofone or more buds by Kerria Japonica.
• Place the cutting segments flat on the potting soil, bud side up.
• Leave enough space between each to facilitate future "transplanting"
• Cover them with 2 cm of substrate.
• Tamp with the plank.
• Place under a hut, a greenhouse or a veranda, unheated.

5th step:

• Transplanting occurs when the segments have taken root and the buds have developed, usually in the spring.

When to plant the Japanese hornwort - Kerria Japonica ?

The very hardy shrub can be planted more particularly at 2 periods:
In autumn, starting in October.
• At the beginning of spring.

How to plant them?

• Prepare the soil by working it halfway up the spade, in order to obtain a nice, homogeneous soil.
• If the soil is too heavy, add a few shovels of river sand.
• Plan to separate plants 2.5 m.
• Place the plants.
• Fill with the garden soil and sand mixture.
• Tamp well with your hand or foot without damaging the roots.
• Water.

Interview :

• Watering: summer in very dry weather.
• Cut the stems faded flowers.

Info from the amateur gardener:

The Japanese corest does not branch, its large stems start from the stump, grow quickly and then bear the flowers. As they age, the twigs bear fewer flowers. The flowers of the corête are carried by the wood of the year. To keep flowering intact, at the end of flowering, cut back the stems that brought the flowers to about 40 cm from the ground.


• April and May, sometimes a small recovery in September.


Kerria Japonica Pleniflora : with double flowers that form real "pompoms", this is the most floriferous variety.
Kerria Japonica Golden Guinea: with single flowers of a beautiful golden yellow.
Kerria Japonica Picta: Single flowers and variegated green and cream foliage.

What to plant with a Japanese corete?

• Plant them with a snowball viburnum, a spirea, and blue or purple flowering shrubs such as dead nettles.

Use :

ATa garden: in clumps, isolated, hedges ...
• Without garden:
In a very large pot!

Quick sheet:

The image illustrating the japan corete sheet is produced by ignis (many thanks to him) at (japan) under Creative Commons License.

Japanese hornet (Kerria japonica), with yellow pompoms

The Japanese corest is a deciduous bushy shrub that comes from China and Japan where it grows easily in thickets and forests. Its habit is irregular, quite bushy because it sucks without any concern, with arched stems.

Its finely toothed alternate leaves are simple, light green in color, embossed. The numerous flowers that develop along the entire length of the twigs are yellow, with a cup shape but frequently in pompoms 3 or 4 cm in diameter, more or less dense depending on whether they are single or double.

It is easy to grow: it is not fragile since diseases do not reach it, it is very resistant to frost and will ignore windy situations or a polluted atmosphere in the city.

  • Family: Rosaceae
  • Type: shrub
  • Origin: China, Japan
  • Color: yellow flowers
  • Sowing: no
  • Cutting: yes
  • Planting: autumn
  • Flowering: April-May
  • Height: up to 3 m

Planting takes place in autumn or winter.
The soil in your garden should be drained, cool, rich and acidic, neutral or calcareous.
The exposure should be semi-shaded or sunny.
There is a little maintenance to be expected. The Japanese Corestus is very hardy and tolerates winter temperatures in the order of -25 ° C.
Perform a cleaning or shaping pruning after flowering. At the same time, be sure to remove a few branches in the center to let in the light.
It is a shrub that sucks a lot. Regularly remove excess suckers.

Flowering appears in spring. It consists of a multitude of small yellow flowers, single for the type species and double for some cultivars.

© kenpei


Other species of Kerria present on the site:

This beautiful shrub that the Japanese call Yamabuki is native to both Japan and southern China.

From its Latin name, kerria japonica, this bushy shrub produces very pretty little golden yellow flowers that will be appreciated in early spring.

Its vigorous vegetation, its evergreen stems and its pretty foliage shine when the deep yellow flowers appear.

In hedges or in beds, it shines in the garden but also in pots on a terrace or balcony.

Photo : Frédéric MARRE
Text: Therese TREDOULAT

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Species and Varieties of Kerria japonica

Korea of ​​Japan (Kerria japonica)

Type species

  • Flowering: Numerous small golden yellow flowers from April to June, then in late summer.
  • Vegetation: HeightВ Г — В spread 1.50В to 2В m. Twigs round, flexible, arched, green all year round. Leaves dentate, wrinkled, heart-shaped and pointed, bright green.
  • Qualities: Almost no longer cultivated.

  • Flowering: Very many double flowers resembling pompoms.
  • Vegetation: Height 1.80В А 2В mВ Г — В Also 2В А 2.50В m.
  • Qualities: The most cultivated variety. Especially flowering.

  • Flowering: Single creamy white flowers with yellow stems.
  • Vegetation: HeightВ: 1.80В Г 2В m.

'Golden Guinea'

  • Flowering: Large, single flowers.
  • Vegetation: HeightВ: 1.50В Г 2В m. Tuft lighter and less dense than 'Pleniflora', allowing light to pass through.
  • Qualities: Less suckering than a species.

  • Flowering: Simple flowers.
  • Vegetation: HeightВ: 1В Г 1.50В mВ Г — В widthВ: 0.80В Г 1.20В m. Variegated leaves of cream.
  • Qualities: Slow growth.

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