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Forsythia koreana Flying Machine - Korean goldenbell tree

Forsythia koreana Flying Machine® (‘Sunny’ Flying Machine®)
Forsythia, Gaenari, Korean goldenbell tree

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More information

Proven Winners
A small deciduous bush, 1.20 metres (3 feet 11 inches) tall, with a bushy and relaxed habit.  Thin stems are adorned with unique foliage which is finely veined with white-cream on a green background, giving it a very beautiful granite-like appearance. Golden yellow spring flowers appear along the naked branches. A unique bush to discover, very hardy and not very demanding.
Flower size
3 cm
Height at maturity
1.75 m
Spread at maturity
1.10 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
all types
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time March to May
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Description

The 'Kumsun' Korean Forsythia or Forsythia koreana in latin, is a small deciduous shrub which is quite unique. Its superb foliage has a granite-like appearance, but in reality it is finely veined with cream-white on a green background. It has a bushy and relaxed habit which is slightly spreading with thin stems.  This distinguishes it from other Forsythias, which can sometimes be a bit stiff. Its spring flowers, with small golden yellow bells scattered along the bare branches, clearly demonstrates its relation with other Forsythias, our spring stars. This is an original variety to discover which is as hardy as the others and can be showcased as a specimen, in the center of a border, or even in a very large pot on the terrace.

 

The 'Kumsun' Korean Forsythia belongs to the olive family. This variety comes from the Korean Forsythia, which was once considered a subspecies of F. viridissima, native to China, but is now classified as a separate species. 'Kumsun' is different from other Forsythias due to its graceful, bushy and slightly spreading habit.  It keeps its spread within 1.2 metres (3 feet 11 inches) in all directions. Its slender and flexible branches are reddish-brown. Like the others, it provides a true spring spectacle from March to May, literally covered with numerous small bell-shaped flowers in bright yellow. The flowers are followed by the emergence of deciduous foliage, and what foliage it is! The 'Kumsun' Korean Forsythia is one of the few in its species to have tender green foliage with numerous veins colored cream and yellow, creating a very bright variegated pattern. 

 

The 'Kumsun' Forsythia is hardy and very easy to maintain.  It grows in all types of soil as long as the soil does not retain too much winter moisture. It can be cultivated in pots due to its small size, as a specimen or in groups in borders, particularly with Pink Abeliophyllum, Abelia grandiflora, Smoke Bush or with Mahonia or Mock Orange. It can also be used as a flowering hedge as its branching is quite low and it tolerates pruning well. You can also train it against a wall. Its branches can be cut in early December and placed in a vase, they will flower for Christmas.

Forsythia koreana Flying Machine - Korean goldenbell tree in pictures

Forsythia koreana Flying Machine - Korean goldenbell tree (Flowering) Flowering
Forsythia koreana Flying Machine - Korean goldenbell tree (Plant habit) Plant habit

Plant habit

Height at maturity 1.75 m
Spread at maturity 1.10 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour yellow
Flowering time March to May
Inflorescence Solitary
Flower size 3 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Forsythia

Species

koreana

Cultivar

Flying Machine® (‘Sunny’ Flying Machine®)

Family

Oleaceae

Other common names

Forsythia, Gaenari, Korean goldenbell tree

Botanical synonyms

Forsythia viridissima var. koreana Flying Machine or ‘Sunny’ Flying Machine

Origin

Cultivar or hybrid

Product reference20664

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From €3.70 Bare root

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Planting and care

The Korean Forsythia 'Kumsun' appreciates a sunny exposure as well as partial shade. Place it in any ordinary soil, preferably moist, avoiding overly chalky and arid soils.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Back of border, Free-standing, Hedge
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Planting spacing Every 150 cm
Exposure Sun, Partial shade
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture all types, Well-drained

Care

Pruning instructions After flowering, every 2 years, prune it back to promote the future flowering. For the first 3 years, a simple removal of dead, thin or misplaced stems will suffice.
Pruning Pruning recommended once a year
Pruning time April to May
Soil moisture all types
Disease resistance Very good
Overwinter Can be left in the ground

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