Rhododendron Double Dots
Rhododendron Double Dots
Rhododendron x calophytum 'Double Dots'
Hybrid Rhododendron
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Description
Rhododendron ‘Double Dots’ is a large-flowered hybrid noted for its double pale pink corollas heavily spotted with red. With its dense habit and evergreen foliage, this shrub looks splendid in semi-shade scenes, at the edge of woodland, in acid soil beds, or in a container on a sheltered patio. Its mid-May flowering is enchanting.
Belonging to the Ericaceae family, ‘Double Dots’ is a horticultural hybrid selected in the Netherlands and registered in the 1990s. It is the result of a cross between R. ‘Whitney’s Tiger Lily’ and a seedling of 'Graf Lennart' pollinated by Rhododendron calophytum; the latter is responsible for the dark red spots visible in the flowers and the size of the inflorescences. The cultivar name refers to the well-marked 'dots' at the heart of the petals.
It is a shrub with an upright, well-branched habit of moderate growth. In open ground, it reaches about 1.50 m in height and 1.20–1.50 m in spread after 10 years. The evergreen, leathery, lanceolate to oblong leaves are medium green, matt to slightly glossy. Flowering occurs from mid-May to early June, depending on the climate. The floral trusses are corymb inflorescences, borne at the tips of shoots, composed of large, double, funnel-shaped, pale pink flowers, spotted dark red on the upper lobe.
Hardiness: −12 to −15 °C in well-drained, mulched soil.
Plant ‘Double Dots’ at the edge of a woodland or near a path, to enjoy its flowering more easily. You can pair it with Pieris japonica ‘Mountain Fire’ for its colourful young foliage, and the compact Japanese Maple ‘Orange Dream’. At their base, Hosta ‘Halcyon’ and June’ will carpet the ground without competing with its shallow roots. Complete with a Dryopteris erythrosora, a fern which is decorative all year round. Other compact rhododendrons such as 'Fragrantissimum', ‘Kalinka’, or ‘Blue Jay’ will form a cohesive bed in semi-shade, with staggered flowering times and compatible heights.
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
x calophytum
'Double Dots'
Ericaceae
Hybrid Rhododendron
Cultivar or hybrid
Planting and care
Plant Rhododendron 'Double Dots' in a semi-shaded position, protected from cold, drying winds. It requires moist, humus-bearing, light, acidic soil without limestone. Like all ericaceous plants, it cannot tolerate dry soils, nor heavy soils that are waterlogged in winter. If the soil remains moist in summer, this rhododendron will also tolerate morning sun. Avoid planting at its base, as its shallow roots do not cope well with competition from other plants, especially for water.
Dig a hole three times the volume of the pot. Soak the root ball in water (non-limestone) and plant the shrub at collar level, in a mixture composed of 1/4 peat, leaf mould, gravel or pozzolana, and loam. Water generously and keep the soil damp in summer. Azaleas and Rhododendrons have a shallow root system. Consequently, they do not cope well with long periods of drought. Therefore, a soil enriched with humus and abundant watering during dry periods is recommended. Moreover, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pozzolana, clay balls) at planting. Apply a mulch of shredded pine bark at the base of the shrub every spring to maintain soil moisture while preserving an acidic pH.
Maintenance involves cutting off faded flowers in summer and cleaning out dead branches. Azaleas and Rhododendrons can sometimes be attacked by vine weevils, which eat the edges of leaves and rootlets, as well as by the infamous 'rhododendron lace bug', which does not often cause severe damage. Effective organic solutions now exist against vine weevils. Yellowing of leaves (chlorosis) in Rhododendron indicates poor iron assimilation and causes premature death of the plant. It is possible to apply iron chelate diluted in water. However, while limestone is usually the cause, poorly drained soil or a root ball planted too deeply can also explain the phenomenon.
Rhododendrons perform at their best in cooler climates, planted in acid soil and in a humid environment. Their cultivation in warmer, drier climates is generally doomed to failure in the long run, despite all 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).
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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.