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Value-for-money

Japanese Azalea Sylvester

Rhododendron (Azalea) Sylvester
Japanese Azalea

4,8/5
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The Japanese azalea is superb!

Claude E., 27/04/2019

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This plant carries a 24 months recovery warranty

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Value-for-money
An evergreen Azalea, whose luminous flowers in two shades of pink create a beautiful two-tone effect: its small silvery-pink trumpet-shaped flowers, with a deep pink heart, almost cover the foliage in April-May. This fairly compact bush also has dense foliage that remains attractive all year round.  It is a very cold-resistant variety, to be grown in partial shade, in an acidic and moist soil, or in a pot on the terrace.   
Flower size
3 cm
Height at maturity
80 cm
Spread at maturity
80 cm
Exposure
Partial shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time March to May, September to October
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Flowering time April to May
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Description

The 'Sylvester' Japanese Azalea, a small evergreen bush from the large family of Rhododendrons, is striking because of its particularly luminous two-tone pink flowers. Its small trumpet-shaped spring flowers, with a silver-pink exterior and deep pink heart, almost completely cover its foliage with a very intense pink coat. This hardy, small-sized shrub also boasts dense foliage that remains attractive all year round. Japanese Azaleas are wonderful in pots on the terrace or as border plants. They merit the changes needed to create their preferred conditions: they thrive in partial shade, in a lime-free soil that is always moist.

 

The hybrid Rhododendron Sylvester is part of a series of evergreen hybrids derived from the Kurume Rhododendron. This group of azaleas, the result of 300 years of selection in Japan, takes its name from the Japanese city of Kirin. These plants have small, tough foliage and are known for their resistance, adaptability, prolific flowering, and vibrant colours. Their complex genealogy most likely includes the Asian species Rhododendron kaempferi , R . kiusianum, as well as various Japanese species and old hybrids. It is generally advisable to protect them from extreme cold. 'Sylvester' is, however, hardy down to -20°C (-4 °F).

'Sylvester' is a modest-sized variety, with a very rounded habit. The plant will reach approximately 80 cm (31.5 in) in height and spread by the age of 10, depending on the growing conditions. The bush will not exceed 1.10 m (3.61 ft) even after many years, as it is slow-growing. It usually starts flowering in April, or even early May depending on the climate. It consists of countless small trumpet-shaped flowers with a corolla of satin petals in a light, bright pink. The flower's heart is a deeper pink and has long stamens of the same dark pink color. These flowers are gathered in terminal clusters of 3 to 5. The foliage, evergreen when the plant grows in shaded conditions, tends to be partially deciduous in a sunny position. It is composed of small, simple leaves measuring 2 to 3 cm (0.8 - 1.2 in), ovate, with smooth edges, arranged alternately on the branches. They are rather deep green in colour, whilst the young leaves that appear after flowering are a beautiful light green. Azaleas and Rhododendrons have a shallow root system that always needs to be kept moist, but they also dislike waterlogged soil which would suffocate them.

 

Japanese Azaleas thrive in humid and cool climates, with distinct winters, planted in humus-rich, acidic soil, such as ericaceous soil. In these conditions, they are very attractive evergreen shrubs for flowerbeds or containers all year round. They harmonize beautifully with heathers, Japanese maples, or their Chinese counterparts that change their colours with the seasons. Combine them with Japanese camellias and their graceful, often fragrant, autumn-flowering cousins, the Camelia sasanqua hybrids. This Sylvester variety, forming a mound covered with intense pink flowers, will be splendid on the terrace or balcony, in a large,  chosen pot, planted in suitable soil and watered with lime-free water.

 

Japanese Azalea Sylvester in pictures

Japanese Azalea Sylvester (Flowering) Flowering
Japanese Azalea Sylvester (Foliage) Foliage
Japanese Azalea Sylvester (Plant habit) Plant habit

Plant habit

Height at maturity 80 cm
Spread at maturity 80 cm
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour pink
Flowering time April to May
Inflorescence Cyme
Flower size 3 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron (Azalea)

Cultivar

Sylvester

Family

Ericaceae

Other common names

Japanese Azalea

Origin

Cultivar or hybrid

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Planting and care

Unlike the Chinese Azalea, the Sylvester Japanese Azalea prefers a rather shady spot,  but its preferred postion is in partial shade, sheltered from dry and cold winds. This variety dislikes prolonged and severe frosts that can harm its early flowering. Protect it as soon as the thermometer drops below -10°C (14 °F) by storing it in a bright, unheated, but frost-free room.

Plant it in ericaceous or humus-rich, well-drained, non-calcareous soil and one that remains moist even in summer. When planting, make sure not to bury the root ball too deep, level with the surface of the soil. Water abundantly during dry periods, at least once a week in the first year, with lime-free water. In spring, apply 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 lacebug", not often causing significant damage. If the soil is chalky or poorly drained, and if the root ball is planted too deep, the leaves may turn yellow and eventually die.

 

Planting period

Best planting time March to April
Recommended planting time March to May, September to October

Intended location

Suitable for Woodland edge
Type of use Border, Edge of border, Container
Hardiness Hardy down to -15°C (USDA zone 7b) 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 so sparingly, as severe pruning could compromise future flowering.
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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