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Rhododendron Scyphocalyx

Rhododendron Scyphocalyx
Rhododendron

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Very floriferous and original variety that is covered in spring with bouquets of large bicolored trumpets, bright pink with an orange throat turning to ochre yellow. These flowers attract the eye even in a shady corner of the garden. The bush is compact, wider than it is tall, and remains decorative all year round, adorned with large glossy dark green evergreen leaves. It is a perfect plant to accompany woodland bulbs in a shaded bed or to enhance a large pot on a balcony, as long as it is provided with a bit of light and acidic, well-drained soil that remains slightly moist during the summer.
Height at maturity
1 m
Spread at maturity
1.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -18°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 'Scyphocalyx' is a hybrid whose bicoloured flowering is incredibly vibrant and vivid. It forms a bush with a wider than it is tall, dense and well-branched. Its evergreen foliage, tough and luxuriant dark green, creates permanent interest for borders and containers. It is a very floriferous variety that offers countless bouquets of bright pink flowers, highlighted by an orange to ochre yellow throat. With intense and warm flowers, it's ideal for attracting attention to the slightly shaded corners of the garden. Enhance its flowering by planting it isolated at the edge of your terrace or by combining it in a semi-shaded border with other ericaceous shrubs.

Rhododendrons are plants from the Ericaceae family, just like heathers, preferring soils devoid of limestone, with an acidic tendency, as well as humid climates. 'Scyphocalyx' is a hybrid rhododendron that stands out for its abundant, bicoloured, and highly colourful flowering. It naturally forms a very dense bush with a spreading habit, about 1m (3ft) tall and 1.5m (5ft) wide. Its growth is moderately fast. Its evergreen leaves, dark green with a slightly satin finish, are elliptical in shape and cover the plant well. They have a very velvety underside. The young shoots are a beautiful carmine red to purple. In April-May, remarkably abundant flowering submerges the bush: beautiful and large bell-shaped flowers open in voluminous corymbs. Their bright pink colour with a lighter, orange to ochre yellow throat, maculated with reddish-brown spots, is highlighted by the shiny texture of the petals and the white tips of the stamens, like small jewels grouped at the heart of the flower.

Rhododendron 'Scyphocalyx' is a brilliant shrub, hardy down to -15°C (5°F), or even -20°C (68°F), and easy to grow as long as the conditions suit it, in terms of soil and climate. Even though they prefer a semi-shaded exposure, hybrid rhododendrons with large flowers tolerate the sun as long as it is not scorching and their base remains moist. 'Scyphocalyx', with its generous and sparkling flowering, will beautifully decorate a small semi-shaded space in the garden, the terrace, or the balcony. Plant it in the company of ferns, blue or variegated hostas, Pieris, heathers, Kalmias, 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-limestone water, as well as specific fertilizer for ericaceous plants.

Rhododendron Scyphocalyx in pictures

Rhododendron Scyphocalyx (Flowering) Flowering

Plant habit

Height at maturity 1 m
Spread at maturity 1.50 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour two-tone
Flowering time April to May
Inflorescence Corymb

Foliage

Foliage persistence Evergreen
Foliage colour dark green
Foliage description Elliptical leaves with pointed apex, with fuzzy undersides, of leathery texture, evergreen.

Botanical data

Genus

Rhododendron

Cultivar

Scyphocalyx

Family

Ericaceae

Other common names

Rhododendron

Origin

Cultivar or hybrid

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Planting and care

Plant the 'Scyphocalyx' Rhododendron in a semi-shaded position, protected from cold and drying winds, in a moist, humus-rich, and light soil with an acidic tendency, free from limestone. Like all ericaceous plants, it cannot tolerate limestone or heavy soils that become waterlogged in winter. If the soil remains moist in summer, this rhododendron can also tolerate non-scorching sunlight. 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 collar level in a mixture composed of leaf compost, gravel or pumice, and loam. Water generously and keep the soil moist in summer. Azaleas and rhododendrons have a shallow root system and therefore fear long periods of drought. That is why it is advisable to enrich the soil with humus and water abundantly during dry periods. Moreover, 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 crushed pine bark around the base of the bush every spring to maintain soil moisture while preserving an 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 notorious "rhododendron borer," which does not often cause severe damage. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor assimilation of iron from the soil and 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 warmer and drier climates is generally doomed to failure in the long run, despite all attempts to acclimate them.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing, Container
Hardiness Hardy down to -18°C (USDA zone 7a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial 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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