Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron
Rhododendron x catawbiense Grandiflorum
Rhododendron, Mountain Rosebay
Impeccable, a very beautiful plant.
Coco, 26/05/2026
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Description
The Rhododendron catawbiense Grandiflorum, is a vigorous and large-sized bush, with impressive flowers. Very close to a particularly sturdy American botanical species, it impresses with its resistance to cold and difficult conditions, as well as being spectacular in spring, when it almost disappears under a massive flowering. Gathered in generous clusters, its large light lilac flowers with golden eyes, speckled with brown at the throat, bloom without restraint. Under its lush and almost exotic appearance, this large 'rhodo' hides a flawless robustness.
Rhododendrons are plants from the heath family, just like heathers, preferring soils devoid of lime, with an acidic tendency, and humid climates. Rhododendron catawbiense is a botanical species originating from the U.S.A, from the mountain slopes of the southern Appalachians that extend from Virginia to Georgia. It is characterized by remarkable resistance to cold and diseases that can sometimes affect these bushes. Frequently planted in American gardens, it has been hybridized with species originating from the Himalayas that are less hardy, to produce some of our most spectacular rhododendrons.
'Grandiflorum', introduced to the market before 1850, forms a large bush with a spreading habit, wider than tall. Its growth is relatively fast, reaching an average height of 2.50m (6.6ft) and a spread of 3m (9.8ft) under good conditions. The branches are abundantly adorned with beautiful dark green glossy foliage, composed of evergreen leaves that are narrow, slightly arched, and ovate. The remarkably abundant flowering takes place from the end of May to mid-June. The large funnel-shaped flowers are gathered in large spherical clusters with a lush appearance. The colour of the flowers, mauve dotted with golden yellow and brown, is particularly bright in shade. This heathland bush is best in partial shade in cool, humus-rich, and well-drained soil with an acidic pH.
The Rhododendron catawbiense 'Grandiflorum'' can be used as a specimen or in mass plantings, in the company of other acid-loving plants. It can be associated with Chinese azaleas, with which it complements and tempers the warm tones, magnolias, andromedas (Pieris), mountain laurels (Kalmia), Japanese maples with green or purple foliage... In a large garden, it can even create a majestic hedge in the company of other large rhododendrons.
Rhododendron catawbiense Grandiflorum - Large-flowered rhododendron in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
x catawbiense
Grandiflorum
Ericaceae
Rhododendron, Mountain Rosebay
Cultivar or hybrid
Planting and care
Plant Rhododendron catawbiense 'Grandiflorum' in partial shade, protected from cold and drying winds, in a moist, humus-rich and light, acidic soil. Like all plants in the heath family, it does not tolerate chalky soils or heavy soils saturated with water 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 collar level, in a mixture composed of 1/4 organic matter, 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 prolonged periods of drought. This is why soil enriched with humus and abundant watering during dry periods is recommended. In addition, this root system is not very strong, so it is essential to lighten heavy soils with free-draining materials (gravel, pumice, clay balls) when planting. Apply a mulch of shredded pine bark around 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 dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as the infamous "rhododendron beetle," which rarely causes severe damage. However, you can apply a treatment with carbofuran. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor take-up of iron from the soil and can lead to premature plant death. While chalk is often the cause, poorly drained soil or deeply planted root balls can also cause 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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