Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron Cosmopolitan
Rhododendron
Has not flowered... Is in a pot in the garden.
Frederic, 01/11/2021
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Description
The 'Cosmopolitan' hybrid Rhododendron is a very beautiful Rhododendron that will quickly become the star of a ericaceous bed or a balcony! This variety has dense vegetation and a well-rounded bushy habit. The bush produces a mass of small flowers, soft pink with purple markings in the throat in April-May. Decorative throughout the year, this evergreen shrub is grown in ericaceous soil, in partial shade or exposed to morning sun if the soil remains moist. A reliable choice!
Rhododendrons are plants of the Ericaceae family, just like heathers, preferring chalk-free, acidic soils and damp climates. The result of a cross, the Rhododendron 'Cosmopolitan' forms a dense, rounded bush, reaching about 1.50 m (4.92 ft) in height and spread. It is fairly slow growing. Its shiny medium green, evergreen leaves are elliptical in shape and cover the plant well. They have a velvety underside. In April-May, depending on the climate, an abundance of flowers overwhelms the shrub: grouped in voluminous corymbs, its intense pink flower buds open, offering beautiful soft pink flowers with strongly marked, dark pink throats. Nectar-rich, they are much frequented by pollinating insects.
The Rhododendron 'Cosmopolitan' is a floriferous plant and is very hardy, down to -15°C (5 °F) or even -20°C (-4 °F). Even though they prefer partial shade, hybrid Rhododendrons can tolerate a moderate morning sun provided their base remains cool and moist. 'Cosmopolitan', with its abundant of bright flowers, will easily dress up a shady corner 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. Rhododendrons can also be used to create beautiful hedges, on their own or combined possibly with camellias or mimosas (in mild climates). Cultivating them in containers requires regular watering with non-alkaline water and specific fertilizer for ericaceous plants.
Rhododendron Cosmopolitan in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
Cosmopolitan
Ericaceae
Rhododendron
Cultivar or hybrid
Planting and care
Plant the Rhododendron 'Cosmopolitan' in a semi-shaded position, protected from cold, drying winds, in a light, moist, humus-rich, either acid or neutral soil. Like all ericaceous plants, it does not tolerate chalky or heavy soils that become waterlogged in winter. If the soil remains moist in summer, this Rhododendron will also tolerate exposure to the morning sun. Avoid planting at its base, as its shallow roots do not tolerate competition from other plants, especially for water.
Dig a hole three times larger than the pot. Soak the root ball in non-alkaline water and plant it level with the top of the soil, in a mixture composed of 1/4 peat, leaf mould, horticultural grit or perlite, 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 soil enriched with humus and generous watering during dry periods is recommended. In addition, this root system is not very strong, which is why it is essential to lighten heavy soils with free-draining materials (horticultural grit, clay pellets) when planting. Apply a mulch of shredded pine bark around the base of the shrub every spring to keep the soil moist while maintaining an acidic pH.
Maintenance consists of removing faded flowers in summer and clearing out 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 lacebug," which do not often cause 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 deeply planted root balls 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).
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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.