Rhododendron yakushimanum Silberwolke
Rhododendron yakushimanum Silberwolke
Rhododendron yakushimanum Silberwolke
Rhododendron yakushimanum Silberwolke
Yakushima Rhododendron, Yakushimanum Rhododendron
Beautiful this year, bought 3 years ago these flowers are superb I am delighted.
Angélique, 08/05/2025
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Description
Rhododendron 'Silberwolke' is a fairly recent and particularly floriferous hybrid, derived from the Japanese species yakushimanum, which has bequeathed it a compact habit. Its flowering in May-June is a delight for the eyes: clusters of purple-pink buds open into wavy pale pink flowers, becoming almost white over time. The evergreen dark green foliage adorns its branches, whose stout architecture evokes Japanese art. A bright and romantic variety, awarded by the RHS in England in 2005, perfect for easily dressing a small shaded area of the garden.
Rhododendrons are plants of the Ericaceae family, just like heathers, preferring predominantly limestone-free, acidic soils and humid climates. Rhododendron yakushimanum 'Silberwolke' forms a dense bush with a rounded habit of approximately 1.2 m (3 ft 11 in) in all directions at maturity. Its growth is rather slow, usually reaching 90 cm (35.4 in) at the age of 10. Its persistent leaves are dark green and matt, elliptical in shape and cover the plant well. They have a very fuzzy, reddish-brown underside. In May-June, its remarkably abundant flowering overwhelms the plant: grouped in corymbs, purple-pink floral buds open into large flowers with silky, undulating petals in a soft pink border. They are adorned with a very light yellow-green macule, as if sprinkled with gold powder. Over time, the flowers fade to a very soft white-pink hue.
Like all yakushimanum hybrids, affectionately nicknamed "yak rhodos" by specialists, Rhododendron 'Silberwolke' is quite hardy down to -15 °C (5 °F) or even -20 °C (-4 °F). Although they prefer a semi-shaded exposure, these hybrids can tolerate the sun as long as it is not scorching and their base remains cool. 'Silberwolke', with its abundant and bright flowering, will easily dress a small shaded area of the garden, in the company of ferns, blue or variegated hostas, Pieris, heathers, Kalmias, Azaleas and Japanese Maples, or other rhododendrons from the same group to create superb patchworks of textures and colours in spring. Growing in containers requires regular watering with non-limestone water and specific fertiliser for acid-loving plants.
Rhododendron yakushimanum Silberwolke in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
yakushimanum
Silberwolke
Ericaceae
Yakushima Rhododendron, Yakushimanum Rhododendron
Cultivar or hybrid
Planting and care
Plant Rhododendron yakushimanum 'Silberwolke' in a partially shaded position, protected from cold and drying winds, in a moist, humus-rich and light soil, with a tendency towards acidity or neutrality. Like all plants in the heather family, it does not tolerate limestone soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron can also tolerate exposure to non-scorching sun.
Dig a hole three times larger than the pot. Soak the root ball in non-limestone water and plant the shrub at the root collar, in a mixture composed of 1/4 peat, leaf compost, gravel or pumice, and loam. Water generously and keep the soil moist in summer. Azaleas and rhododendrons have a shallow root system. Therefore, they are sensitive to long periods of drought. This is why a humus-rich soil and abundant watering during dry periods are recommended. Additionally, 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 shrub every spring to maintain soil moisture while preserving an acidic pH.
Maintenance consists of removing faded flowers in summer and cleaning dead branches. Azaleas and rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as the famous "rhododendron beetle" which does not usually cause severe damage. Effective biological solutions exist today against weevils. Yellowing of the leaves (chlorosis) in rhododendrons indicates poor assimilation of iron in the soil and can lead to premature death of the plant. 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).
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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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