Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron Cunninghams White
Rhododendron caucasicum x ponticum Cunningham's White
Rhododendron
Very good packaging, the rhododendron is already well developed and looks very promising.
Armelle, 17/10/2025
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Description
The Hybrid Rhododendron 'Cunningham's White' at first sight is a beautiful, vigorous and very healthy plant. This old Scottish variety, still widely planted in gardens and commonly used as a graft, has a dense growth and a particularly hardy temperament. The bush produces a mass of small white flowers with purple markings on the throat in spring, and often again at the end of summer. This Rhododendron tolerates sunny exposures better than many others if the soil remains moist, as well as poor and infertile soils, acidic, neutral or even slightly alkaline if well amended!
Rhododendrons are plants of the Ericaceae family, just like heathers, preferring soils devoid of limestone, with an acidic tendency, and humid climates. Resulting from a cross made by Georges Cunningham in 1830 between Rhododendron caucasicum and R. ponticum var. Alba, Rhododendron 'Cunningham's White' forms a dense bush, initially with an upright habit, taking on a more spreading, wider than tall aspect over the years. At maturity, it will reach about 1.5 metres (4 feet 11 inches) in height and 2 metres (6 feet 7 inches) in spread. Its growth is rather slow, generally reaching 1 metre (3 feet 4 inches) in height and 1.2 metres (3 feet 11 inches) in spread at the age of 10. Its evergreen leaves, of medium to dark green in colour, are elliptical in shape, 13cm (5.1in) long, and cover the plant well. They have a velvety underside. In May-June, depending on the climate, its remarkably abundant flowering overwhelms the bush: its beautiful white flowers, tinged with pink on the edges, with a throat strongly marked with purple-brown, open in 20cm (7.9in) corymbs. It is not uncommon for the bush to bloom again in September, albeit with less generosity. Nectar-rich, they are highly visited by pollinating insects.
Like all Caucasian rhododendrons, 'Cunningham's White' is hardy down to -15°C or even -20°C. Although they prefer a semi-shaded exposure, these hybrids of R.caucasicum, a true mountain plant, can tolerate the morning sun as long as it is not scorching and their base remains cool. "Cunningham's White", with its generous and bright flowering, will easily adorn a small shaded space in 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. Cultivation in containers requires regular watering with non-alkaline water and specific fertilization for heath plants.
Rhododendron Cunninghams White in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
caucasicum x ponticum
Cunningham's White
Ericaceae
Rhododendron
Cultivar or hybrid
Planting and care
Plant Rhododendron 'Cunningham's White' in partial shade or even in non-burning sunlight, protected from cold and drying winds, in a fresh, humus-rich and light soil, with a tendency towards acidity or neutrality, or even very slightly limestone. Like all heather plants, it does not tolerate limestone soils well, nor 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. Give it enough space to spread its branches and bloom on all sides.
Dig a hole with a volume three times larger than the pot. Soak the root ball in non-limestone water and plant the bush at the neck level, in a mixture composed of 1/4 turf, leaf compost, gravel or pumice stone, and loam. Water generously 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-enriched 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 stone, clay pellets) when planting. Apply a mulch of shredded pine bark at the base of the bush every spring to retain soil moisture while maintaining an acidic pH.
Maintenance consists of cutting off faded flowers in summer and removing 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 does not often cause severe damage. Yellowing of the leaves (chlorosis) in rhododendrons indicates poor assimilation of iron in the soil and can cause 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.
Rhododendrons prefer cooler, moister climates.
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.
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