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Azalea japonica Adonis

Rhododendron (Azalea) obtusum Adonis
Japanese Azalea

3,7/5
2 reviews
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1 reviews

Plant received in excellent condition. I put it in a 48 cm (19in) diameter pot in partial shade with water drainage and a mixture of peat soil, local soil, and good compost. In a few days, it was in full bloom. I am particularly pleased with this purchase.

Jean-Michel, 15/04/2020

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This plant carries a 24 months recovery warranty

More information

This evergreen Azalea is a lovely, slightly spreading shrub, reaching 60cm (23.6 in) in height, very hardy, with an early and abundant spring flowering season. 'Adonis' is covered in large, pure white flowers for 3 weeks in April and May. This delightful variety, with its dense, compact habit, is at home in an ericaceous bed or in a pot on the terrace.  
Flower size
5 cm
Height at maturity
60 cm
Spread at maturity
80 cm
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 March to May, September to October
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Flowering time April
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Description

The Japanese Azalea Adonis is a small evergreen ericaceous shrub descended from Rhododendron obtusum, belonging to the large Rhododendron family. With its naturally rounded, compact habit and abundant spring flowers, it is as ornamental in the garden as it is in a pretty pot on the terrace. Forming a perfect cushion of white flowers from April onwards, 'Adonis' is an excellent early-flowering white cultivar, both floriferous and resistant to cold. Give this Azalea the conditions it loves: a semi-shaded position and well-drained, lime-free soil that stays moist all year round. A must in any small Japanese garden!

The Rhododendron obtusum is now considered a hybrid of Rhododendron sataense, R. kiusinum and R. kaempferi. It is a mostly evergreen shrub of the heath or Ericaceae family. All these hardy plants, are native to Japan, China and Korea. They are characterised by early, dazzling spring flowers and foliage that is not entirely evergreen. There are 2 types of foliage on these azaleas, the spring foliage, which is fine and relatively wide, and the foliage that forms at the end of summer, which is tougher and smaller. The spring leaves fall off in autumn, while the majority of the leaves produced in late summer will last throughout the winter

 

'Adonis' is a small, naturally compact cultivar with a spreading, rounded habit, reaching about 60 cm (23.6 in) in height and 70-80 cm (27.6-31.5 in) in spread. Its blooms last for about 3 weeks, usually in April, depending on the climate. The large pure-white, trumpet-shaped flowers are gathered in generous terminal clusters that almost completely hide the foliage which consists of single, oval-lanceolate leaves with smooth edges, arranged alternately on the branches. They vary from 5 to 10 cm (2 to 3.9 inches) in length, and they are fairly light green, with a satiny finish. 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 Japanese camellias, and their graceful, often fragrant, autumn-flowering cousins, the Camellia sasanqua hybrids. This Adonis variety will look wonderful on a terrace or balcony, in a large, carefully chosen pot with suitable compost and lime-free water for watering.

Azalea japonica Adonis in pictures

Azalea japonica Adonis (Flowering) Flowering

Plant habit

Height at maturity 60 cm
Spread at maturity 80 cm
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour white
Flowering time April
Inflorescence Cyme
Flower size 5 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Semi-evergreen
Foliage colour green

Botanical data

Genus

Rhododendron (Azalea)

Species

obtusum

Cultivar

Adonis

Family

Ericaceae

Other common names

Japanese Azalea

Origin

Cultivar or hybrid

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Planting and care

The Japanese Azalea thrives a rather shady location unlike the Chinese Azalea, but its preferred position is in semi-shade. 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.

Japanese azaleas thrive in cool and humid climates, they are generally very hardy but dislike dry air and dry soil.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge
Type of use 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 so 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
3,7/5
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