Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
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Emmanuelle B.
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
Emmanuelle B. • 94 FR
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea
Rhododendron (Azalea) macrosepalum Koromo Shikibu
Large-sepaled Rhododendron, Large-sepaled Azalea
The plant arrived in good condition and already at its full height, apparently. I hope I'll be able to see its flowers next spring.
Hsoq, 31/05/2025
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Description
The 'Koromo-shikibu' azalea, a mysterious beauty from Japan... of unknown origin, this evergreen azalea with a spread habit is covered in spring with delicate, finely-crafted flowers, in a delicate shade of pink with mauve reflections.
Known for several centuries in Japan, the 'Koromo-shikibu' spider azalea could be a hybrid of Rhododendron linearifolium. In March-April, its original flowers with long, slender petals, in a beautiful pink lavender colour with some purple spots, provide a wonderfully delicate spectacle! They emit a delicate fragrance and, if the growing season is long enough, can reappear in autumn!
The Japanese 'Koromo-shikibu' azalea has evergreen leaves, hairy, elongated and dark green. In winter, they take on pretty red-purple tones. It is a spread bush that reaches 60 to 80cm (23.6 to 31.5in) in height at maturity, with a width of 80cm (31.5in) to 1m (3ft 4in). Hardy up to -10°C, the spider azalea requires a bright exposure, without direct sunlight. Ideally plant it in partial shade, in a location protected from cold and dry winds. With a slow growth, this small heather bush likes fresh, humus-rich and well-drained soil with an acidic tendency.
Azaleas dress up heather beds all year round with their evergreen foliage and enliven gardens in spring with their charming and original flowering. Plant them in a shady rock garden, at the edge of a bed or in a container along with Pieris, Heathers, Kalmias, Andromedas, Chinese Azaleas, Rhododendrons and Japanese Maples. Japanese Azaleas are sometimes cultivated in pots, but they are also worked as Bonsai by specialists, making them very beautiful pieces.
Rhododendron macrosepalum Koromo-shikibu - Large-sepaled Azalea in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron (Azalea)
macrosepalum
Koromo Shikibu
Ericaceae
Large-sepaled Rhododendron, Large-sepaled Azalea
Cultivar or hybrid
Planting and care
Plant the Japanese Azalea 'Koromo-shikibu' in semi-shade or shaded exposure, protected from cold and drying winds, in a fresh, humus-rich and light soil, with a tendency towards acidity. Like all plants of heathland, it does not tolerate limestone soils or heavy soils saturated with water in winter. Dig a hole three times larger than the pot volume. Soak the root ball in non-limestone water and plant the bush at the collar level, in a mixture composed of 1/4 peat, leaf compost, gravel or pumice and loam. Water thoroughly and keep the soil moist in summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are sensitive to long periods of drought. That is why a humus-rich soil and abundant watering during dry periods are recommended. In addition, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pellets) when planting. Apply a mulch of shredded pine bark at the base of the bush every spring to maintain soil moisture while preserving an acidic pH. Maintenance consists of removing faded flowers in summer and cleaning dead branches. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron in the soil and can cause premature plant death. While limestone is often the cause, poorly drained soil or a deeply planted root ball 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.