Rhododendron Halopeanum'
Rhododendron Halopeanum'
Rhododendron Halopeanum'
Rhododendron griffithianum × arboreum 'Halopeanum'
Rhododendron
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Description
Rhododendron ‘Halopeanum’, also sold under the name ‘White Pearl’, is a large evergreen rhododendron for gardens with acidic, well-drained soil. Its opulent and bright late spring flowering and its vigour make this bush an excellent choice for creating a tall hedge or a flowering screen. Good heat tolerance and respectable hardiness complete these qualities.
This rhododendron belongs to the Ericaceae family. It is an old hybrid obtained in Normandy: seedlings harvested in 1885 near Cherbourg by Mr. Halopé flowered in 1893, with the hybrid being presented in 1896; the name ‘Halopeanum’ is the Latinisation of the breeder's surname. The parents are Rhododendron griffithianum and R. arboreum. The bush is also widely distributed under the horticultural synonym ‘White Pearl’.
Of vigorous habit, it becomes tree-like with age, with rapid growth in favourable soil. In open ground, the plant reaches 4 to 6 m in height, or even more in an oceanic climate. At 10 years, it measures 1.70 m to 1.80 m in height with a width of about 1.20 m. The brown-grey bark is decorative on old specimens with twisted branches. The stems are robust, branching from the base; the plant does not sucker, but can self-layer directly beneath low branches. The root system is shallow and fibrous, typical of rhododendrons.
Flowering occurs in May. Deep pink buds open into large, funnel-shaped, white corollas with a pink blush when fully open, spotted with crimson red in the throat and with crinkled edges. The conical inflorescences consist of 9 to 12 flowers and can be lightly scented. The evergreen foliage is made up of broad, ovate to oblong, lustrous dark green, leathery leaves on short petioles.
To accommodate this large rhododendron 'Halopeanum' in your garden, you will need space and an acidic, humus-bearing, well-drained but moist soil; choose a location in partial shade or gentle sun, sheltered from the wind. This variety fits into a tall screen at the back of the garden, in an informal hedge, or as a specimen near a lawn. You can associate it with other acid-loving bushes: Camellia japonica ‘Nuccio’s Gem’ for its white winter flowering and glossy foliage, Magnolia soulangeana ‘Lennei’ for its spring flowers, Pieris japonica ‘Forest Flame’ for its colourful young shoots and Rhododendron luteum for its very fragrant yellow spring flowering.
Geographical origin of the parent species: Rhododendron griffithianum is Himalayan (Nepal to Myanmar), and R. arboreum is widespread in the Himalayas and peninsular India; their cross-breeding explains the vigour and size of ‘Halopeanum’. It is one of the oldest European hybrids of rhododendron, still cultivated in large arboretums; some historic specimens reach the size of a small tree and are listed as "remarkable trees" in public collections.
Rhododendron Halopeanum' in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
griffithianum × arboreum
'Halopeanum'
Ericaceae
Rhododendron
Rhododendron ‘White Pearl’
Cultivar or hybrid
Planting and care
Plant Rhododendron 'Halopeanum' in partial shade, sheltered from cold and drying winds, in moist, humus-bearing, light soil, with an acidic tendency. Like all ericaceous plants, it does not tolerate calcareous soils, nor heavy soils, which are waterlogged in winter. Dig a hole three times the volume of the pot. Soak the root ball in water (non-calcareous) and plant the bush at collar level, in a mixture composed of 1/4 peat, leaf mould, gravel or pumice and topsoil. Water copiously and keep the soil moist in summer. Azaleas and Rhododendrons have a limited root system. They do not cope well with periods of drought. This is why a soil enriched with humus and abundant watering during dry periods are recommended. Furthermore, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pebbles) at planting time. Apply a mulch of crushed pine bark at the foot of the shrub every spring to keep the soil moist while maintaining an acidic pH. Maintenance simply involves cutting off the faded flowers in summer and cleaning out its dead branches.
Azaleas and Rhododendrons can sometimes be attacked by vine weevils, which eat the edges of the leaves and the rootlets, as well as by the famous 'rhododendron leafhopper', which does not often cause severe damage. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor assimilation of iron in the soil and causes premature death of the plant. Lime is usually the cause, but poorly drained soil or a root ball planted too deeply 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).
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.