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Rhododendron Irene Koster

Rhododendron (Azalea) (x) occidentale Irene Koster

4,7/5
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Pleasantly surprised by the size and beautiful branches of the received plant. I will provide an update during its flowering.

frédéric V., 20/11/2016

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This plant carries a 24 months recovery warranty

More information

Graden Merit Value-for-money
Chinese Azalea, deciduous, covered with lovely scented flowers, light pink to dark, maculated with golden yellow at the center.
Flower size
7 cm
Height at maturity
1.50 m
Spread at maturity
1 m
Exposure
Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Recommended planting time March to May, September to November
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Flowering time April to May
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Description

The Azalea Irene Koster is a Deciduous Chinese Azalea, covered with pretty fragrant flowers, light pink to dark with golden yellow markings in the center.

 

For botanists, azaleas are small-flowered rhododendrons. The deciduous azaleas, very hardy and of fairly rapid growth, are hybrid forms resulting from complex cross-breeding. The 'Irene Koster' Azalea, 1.5m (5ft) tall, with a dense habit, produces alternate, ovate, villous leaves that turn colour in autumn. Its single, 7cm (3in) in diameter, maculate light to dark pink flowers, in corymbs, are fragrant and have a golden yellow center.

The 'Irene Koster' Azalea grows in acidic soil (peat soil), moist and well-drained, in indirect sunlight or light shade. High humidity is appreciated. Mulch the base with maritime pine bark.

The 'Irene Koster' Azalea is planted in a bed of plants suitable for peat soil, alongside Rhododendrons or Hydrangeas.

Rhododendron Irene Koster in pictures

Rhododendron Irene Koster (Flowering) Flowering
Rhododendron Irene Koster (Foliage) Foliage

Plant habit

Height at maturity 1.50 m
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour pink
Flowering time April to May
Flower size 7 cm
Fragrance Fragrant

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Rhododendron (Azalea)

Species

(x) occidentale

Cultivar

Irene Koster

Family

Ericaceae

Origin

Cultivar or hybrid

Product reference80052

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Planting and care

The 'Irene Koster' Azalea should be planted early in autumn in a light, moist, and acidic soil. In a limestone soil, create a large pocket of pure peat soil. Dig a hole measuring 50cm (20in) in all directions, lay down a geotextile film, and fill it with peat soil. This process prevents the peat soil from mixing with your garden soil. Mulch the soil with maritime pine bark and water generously. Always keep the soil moist, especially in summer. Fertilize in spring with a rhododendron fertilizer. Pruning is unnecessary. Remove faded flowers to promote the emergence of new shoots. The Azalea has few diseases when well established outdoors. It may be attacked by weevils that eat the edges of the leaves and rootlets, as well as by the famous "rhododendron beetle," which rarely causes damage. If this is the case, treat it with carbofuran. If the soil is limestone, if the plant is planted too deep, or if the soil is poorly drained, the leaves may turn yellow.

Planting period

Recommended planting time March to May, September to November

Intended location

Type of use Border, Free-standing, Container
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, well-drained

Care

Pruning instructions Pruning is optional. After flowering, remove dead wood and if you need to limit the branches, do so sparingly, as severe pruning could compromise the flowering of the following year.
Pruning Pruning recommended once a year
Pruning time July to August
Soil moisture Moist soil
Overwinter Can be left in the ground
4,7/5
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