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Rhododendron Rwain

Rhododendron Rwain
Rhododendron

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A wonderful rhododendron that is covered in April-May with large frizzy flowers, coloured from coral pink to orange on a creamy white background, warmed with yellow at the centre. The bush, vigorous and well-branched, carries dense evergreen foliage from the base. This variety is resistant to cold. Cultivate it in ericaceous soil, always kept slightly moist, in partial shade or even in the morning sun.
Flower size
10 cm
Height at maturity
1.50 m
Spread at maturity
1.50 m
Exposure
Partial shade, Shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time February to May, September to October
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Flowering time April to May
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Description

Rhododendron 'Rwain' is a magnificent hybrid variety selected in France by Marc Colombel in 1999, too rare in cultivation considering its numerous qualities. In spring, this bush is covered with large gloriously tricoloured frilly flowers, combining bright coral pink, creamy white, and soft yellow. Vigorous and highly floriferous, the plant is adorned with abundant evergreen foliage that is attractive all year round. It is a hardy specimen with mid-early flowering. 'Rhodos', as spectacular as they are exclusive, only thrive in acidic, rich, moist, but well-drained soil and under humid climates.

Rhododendrons are plants of the ericaceae family, just like heathers. The cultivar Rwain (triploid) is the result of cross-breeding between the varieties 'Kernéostic' and 'Lem's Monarch'. The name Rwain, which may seem enigmatic, is an acronym for Rhododendron Without An Important Name. It forms a large, well-branched bush with a dense habit, often wider than it is tall, reaching approximately 1.50m (5ft) in height at the age of 10 years, under good growing conditions in open ground. According to certain sources, the bush is capable of reaching a height of 2.2m (7ft) in the long term. Its growth is rather slow. Its large leaves are elliptical in shape, dark green and glossy on the upper side, showing a lighter and velvety underside. They remain throughout winter. Around mid-May, for approximately 3 weeks, large flowers with a diameter of 10cm (4in), in the shape of a funnel and composed of highly undulated petals, bloom at the end of the branches in large spherical bouquets or corymbs, grouping several flower buds. The heart of the flower, yellow in colour, is adorned with long golden stamens. The petals range from bright coral pink to maize yellow, creamy yellow, and creamy white.

The Rhododendron 'Rwain' is a hardy plant, up to -15°C (5°F). Although they prefer partial shade, hybrid Rhododendrons can tolerate morning sun as long as it is not scorching and their base remains moist. "Rwain", with its vigour and remarkable flowering, will easily adorn a partially shaded area of the garden, alongside ferns, hostas, Pieris, Japanese Azaleas, or other rhododendrons from the same group, to create superb patchworks of textures and colours in spring.

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Plant habit

Height at maturity 1.50 m
Spread at maturity 1.50 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour pink
Flowering time April to May
Inflorescence Corymb
Flower size 10 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron

Cultivar

Rwain

Family

Ericaceae

Other common names

Rhododendron

Origin

Cultivar or hybrid

Product reference1735111

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Planting and care

Plant the 'Rwain' Rhododendron in a partially shady or even shady location, protected from cold and drying winds, in a moist, humus-rich and light soil, with a tendency towards acid or neutral. Like all plants of the heath family, it does not tolerate limestone soils or heavy soils that are waterlogged 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.

Dig a hole 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 leaf compost, gravel or pumice, and loam. Water thoroughly and keep the soil moist in the summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are susceptible to long periods of drought. Therefore, it is advisable to enrich the soil with humus and water abundantly during dry periods. In addition, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pellets) at planting. Apply a mulch of shredded pine bark at the base of the bush every spring to maintain soil moisture and acidic pH.

Maintenance consists of removing faded flowers in summer and pruning any 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 beetle" which does not often cause significant damage. Effective biological solutions are available today against weevils. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor assimilation of iron from the soil and can lead to 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.

"Rhodos" thrive in cooler climates, planted in limestone-free soil and in a humid environment. Their cultivation in hotter and drier climates is often doomed to fail in the long run, despite all attempts to acclimatise them.

Planting period

Best planting time March to April
Recommended planting time February to May, September to October

Intended location

Suitable for Woodland edge, Undergrowth
Type of use Border, Free-standing, Hedge
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade, Shade
Soil pH Acidic
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Humus-rich or peaty, or even sandy, fertile and well-drained

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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