Azalea japonica Rex - Hybrid Rhododenron
Azalea japonica Rex - Hybrid Rhododenron
Azalea japonica Rex - Hybrid Rhododenron
Azalea japonica Rex - Hybrid Rhododenron
Rhododendron (Azalea) Rex
Japanese Azalea
Just received (October), potted it up.... it’s in great shape...
Nonna, 08/10/2025
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Description
The Rex Japanese Azalea or Hybrid Rhododendron is an evergreen bush with a fairly compact, spherical habit. This robust and vigorous species grows in tiers. It flowers early, from April to May. It produces abundant clusters of 12 to 25 bell-shaped flowers that appear before the leaves. These velvety flowers are salmon-pink and measure 4 to 5 cm (1.6 to 2 in) in diameter.
Native to Japan, this Japanese Azalea can reach a height of 60 cm (23.6 in) to 1 m (3 ft 4 in). Its dense foliage is dark green with small evergreen leaves 25 to 50 cm (9.8 to 19.7 in) long.
It is most commonly used in ericaceous beds, rock gardens, borders or in light woodlands. It can be grown as a specimen plant or in pots on a terrace or in a conservatory.
Divided into 2 horticultural groups, the genus Rhododendron includes, on one hand, Azaleas, both Chinese and Japanese, with small evergreen or deciduous leaves, and 5 stamens per flower, and on the other hand, Rhododendrons, with abundant, evergreen, glossy foliage, and flowers with more than 10 stamens. Although highly debated from a botanical standpoint, this classification is still widely used by horticulture professionals.
Azalea japonica Rex - Hybrid Rhododenron in pictures
Plant habit
Flowering
Foliage
Planting and care
Plant the Rex Japanese Azalea in a partially shaded position, protected from cold, drying winds, in cool, humus-rich, light, acid soil. Like all plants that require ericaceous soil, it does not tolerate alkaline soils or heavy soils that become waterlogged in winter. Dig a hole three times larger than the pot. Soak the root ball in lime-free water and plant the bush at the level with the surface of the soil, in a mixture composed of 1/4 coir, leaf compost, horticultural grit or perlite, and loam. Water generously and keep the soil moist in summer. Azaleas and Rhododendrons have a shallow root system. As a result, they can suffer in long periods of drought. Therefore, we recommend using humus-rich soil and watering copiously during dry periods. Additionally, this root system is not very strong, which is why it is essential to lighten heavy soils with free-draining materials (horticultural grit, perlite, clay balls) during planting. Apply a mulch of shredded pine bark around the base of the shrub every spring to maintain soil moisture and acidity. Maintenance involves cutting off faded flowers in summer and removing dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils, which eat the edges of the leaves and the rootlets, as well as by the famous "Rhododendron lace bug", rarely causing significant damage. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor uptake of iron from the soil and can lead to the premature death of the plant. While chalk is often the cause, poorly drained soil or root balls planted too deeply can also explain the phenomenon.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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