Rhododendron Wilgens Ruby
Rhododendron Wilgens Ruby
Rhododendron Wilgen's Ruby
Rhododendron
Very beautiful rhododendron, nice and green with lots of flower buds; I am looking forward to spring to see its Ruby colour.
Pat, 23/10/2024
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Description
Rhododendron 'Wilgen's Ruby' is a rather old hybrid still highly appreciated for its vigour and the generosity of its shining flowering. Wider than it is tall, dressed in light green foliage, this bush is covered in spring with brilliant balls of almost pure cherry red flowers that catch the eye. A striking colour that radiates in the partially shaded areas of the garden or on the terrace. Attractive all year round, of modest size and radiant when in bloom, this Rhododendron will fulfil all its promises in a non-limestone and humid climate. Combine it with white, violet or purple varieties!
Rhododendrons are plants from the ericaceae family, just like heathers, preferring in their vast majority soils devoid of limestone, with an acidic tendency, and humid climates. Rhododendron 'Wilgen's Ruby' is a Dutch variety dating back to 1951. It belongs to a group of hardy hybrid rhododendrons with large flowers. Its habit is dense, rounded, and wider than it is tall. At maturity, its average dimensions will reach 1.25m (4ft) in height and 1.50m (5ft) in width. Its growth is rather slow. Its evergreen foliage is quite unusual and well-filled. It consists of narrow and long, tough, slightly inwardly folded leaves along the vein. Their colour, rather light green with a glossy finish, enhances the red colour of the flowers. Flowering usually takes place in April-May, lasting about 3 weeks. It is remarkably abundant and overwhelms the bush: beautiful funnel-shaped satin flowers open in round clusters. Their colour is an almost pure red, barely speckled with brown at the throat. The petals open onto pink stamens.
The Rhododendron 'Wilgen's Ruby' is a flowering plant and perfectly hardy, down to -20°C. Even though they prefer partial shade, hybrid Rhododendrons can tolerate the morning sun as long as it is not scorching and their base remains moist. 'Wilgen's Ruby', with its compact habit, and abundant and highly vivid flowering, allows it to catch the eye in partially shaded spaces of the garden and bring a beautiful touch of colour to the balcony or terrace. It can be planted as a focal point in a bed of ferns, blue or variegated hostas. It pairs well with Pieris, Heathers, Kalmias, Skimmia, Azaleas and Japanese Maples, as well as other rhododendrons from the same group to form superb patchworks of textures and colours in spring. Rhododendrons can also be used to create magnificent hedges, alone or with camellias or mimosas (in mild climates) for example. Cultivating in containers requires regular watering with non-limestone water and specific fertilizers for acid-loving plants.
Rhododendron Wilgens Ruby in pictures
Plant habit
Flowering
Foliage
Planting and care
Plant Rhododendron 'Wilgen's Ruby' in a semi-shaded position, protected from cold and drying winds, in a moist, humus-rich and light soil, with an acidic or neutral tendency. Like all plants of the heather family, it does not tolerate chalky soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron will also tolerate morning sun exposure. Avoid planting at its base, as its shallow roots do not tolerate competition from other plants, especially for water resources.
Dig a hole three times larger than the pot. Soak the root ball in non-chalky water and plant the bush at the collar level, in a mixture composed of leaf compost, gravel or pumice, and loam. Water thoroughly and keep the soil moist in the summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are sensitive to long periods of drought. That's why it is recommended to enrich the soil with humus and to water abundantly during dry periods. 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) at planting. Apply a mulch of shredded pine bark at the base of the bush every spring to keep the soil cool while maintaining an acidic pH.
Maintenance consists of removing faded flowers in summer and pruning out dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as by the famous "rhododendron beetle" which does not often cause severe damage. Effective biological solutions exist today against weevils. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and can cause premature death of the plant. While limestone is often the cause, poorly drained soil or deeply planted root balls can also explain the phenomenon.
"Rhodos" thrive in cooler climates, planted in soil free of limestone and in a humid environment. Their cultivation in hotter and drier climates is often doomed to failure in the long run, despite all the efforts to acclimatise them.
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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