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Azalea japonica GILBERT MULLIE

Rhododendron (Azalea) japonica GILBERT MULLIE
Japanese Azalea

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A medium-sized Japanese Azalea, with a rather spreading habit, flowering abundantly with large, fresh, bright pink blooms in spring. Its small dark green foliage, often evergreen, takes on bronze tones in winter. Well-suited to growing in containers and small spaces, it should be grown in partial shade, in ericaceous soil that remains moist.
Flower size
4 cm
Height at maturity
90 cm
Spread at maturity
1 m
Exposure
Partial shade
Hardiness
Hardy down to -18°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to May, October to November
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Flowering time April to May
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Description

The Japanese Azalea Gilbert Mullie was selected for the abundance of its beautiful, fresh pink flowers, which are larger than usual for a Japanese Azalea. They bloom prolifically in spring, on a plant that is slightly wider than tall, adorned with small dark green leaves that remain decorative in winter. With a rather compact habit, it is a variety that is well-suited to small spaces and container gardening. It is a highly ornamental ericaceous shrub that will bring a unique touch to shaded rockeries or the gap left under large rhododendrons.

The Azalea japonica Gilbert Mullie, resulting from a cross between the 'Kirin' and 'Mother's Day' Azaleas, was developed by the Genetics & Hybridisation Department in Melle, Belgium, in 1985.

It is a modest-sized variety with a dense habit, initially rounded and spreading somewhat with age, forming a parasol shape. It is slow-growing and reaches about 80-90 cm (31.5-35.4 in) in height and 1 m (3 ft 4 in) in spread by the age of 10-12. Its particularly abundant flowers bloom in May, or even sometimes as early as April, depending on the climate. The 4 cm (1.6 in) diameter flowers are funnel-shape and grouped in terminal clusters of 4 to 5, almost hiding the foliage, which is often evergreen in winter and consists of small, shiny, elliptical leaves with smooth edges, arranged alternately on the branches. They are dark green with bronze highlights. This variety is hardy down to -15°C (5°F). Azaleas and Rhododendrons have a shallow root system that always needs to be kept moist, but they also dislike waterlogged soil which would suffocate the roots.

 

Japanese Azaleas thrive in cool climates with distinct winters, planted in humus-rich, ericaceous soil. They are very beautiful evergreen shrubs for borders or containers, attractive all year round. They are a perfect accompaniment to heathers, Japanese maples, or their relatives, Chinese Azaleas, which change colour with the seasons. They can also be combined with flowering cherry trees, Japanese camellias, and their graceful, often fragrant, autumn-flowering cousins, the Camellia sasanqua hybrids. This modest-sized Gilbert Mullie variety can be used to play with levels and fill the gaps below large ericaceous shrubs. It will be magnificent in a large, cool, shaded rockery or at the front of a border in a small Japanese or romantic-style garden, as well as on a terrace or balcony in a large, carefully chosen pot with suitable compost and lime-free water for watering.

 

Azalea japonica GILBERT MULLIE in pictures

Azalea japonica GILBERT MULLIE (Flowering) Flowering

Plant habit

Height at maturity 90 cm
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour pink
Flowering time April to May
Inflorescence Corymb
Flower size 4 cm

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron (Azalea)

Species

japonica

Cultivar

GILBERT MULLIE

Family

Ericaceae

Other common names

Japanese Azalea

Origin

Cultivar or hybrid

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Planting and care

The Gilbert Mullie Japanese Azalea prefers a rather shady location, unlike the Chinese Azalea, but its preferred position is partial shade. It is a plant that thrives in a humid and cool climate and does not tolerate heat, dry air, or excessively dry or waterlogged soils. Plant it in an ericaceous or humus-rich, well-drained and lime-free soil.  Make sure not to plant the root ball too deep, it should be level with the surface of the soil. Water copiously with alkaline-free water during dry periods, at least once a week in the first year. In spring, apply a fertilizer for ericaceous plants. Pruning is not essential but it is a good idea to prune lightly after flowering to keep the plant looking neat. Remove spent flowers to encourage new growth. The Azalea suffers from very few diseases when well-established outdoors. It can be attacked by weevils that eat the edges of the leaves and rootlets, and by the famous "Rhododendron lace bug", though not often causing significant damage. If the soil is chalky or poorly drained, or if the rootball is too deep, the leaves may turn yellow and eventually die.

 

Planting period

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

Intended location

Suitable for Woodland edge
Type of use Border, Edge of border, Container
Hardiness Hardy down to -18°C (USDA zone 7a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade
Soil pH Acidic
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, humus-rich, well-drained

Care

Pruning instructions Pruning is optional. After flowering, remove dead wood and if you need to limit the branches, do it sparingly, as severe pruning could compromise future flowers.
Pruning Pruning recommended once a year
Pruning time July to August
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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