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Rhododendron Easydendron Diderk Inkarho

Rhododendron x hybrida Inkarho Easydendron® Diderk
Azalea, Rhododendron

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A large variety, with large, highly visible flowers in a bright dark pink. It is tolerant to its planting conditions as it is part of the Inkharo range, which offers grafted subjects that also grow in neutral to slightly chalky, even slightly clayey soils. This variety is cold-resistant. Cultivate it in soil kept slightly moist, in partial shade or even in the morning sun.
Flower size
10 cm
Height at maturity
2.50 m
Spread at maturity
2.50 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 Easydendron Diderk is a hybrid variety with large flowers of a rich and vibrant dark pink, adorned with a yellow blotched with brown spot on the upper part of the flowers. It is part of the Inkharo range which includes hybrids more tolerant to limestone and clay in the soil. Hardy and semi-early flowering, it forms an imposing bush, as wide as it is tall, with glossy, evergreen, dark green leaves. In a large bed, in a hedge or at the edge of trees, Diderk can do without acid soil and be planted in more varied soils, even slightly limestone or somewhat heavy.

Rhododendrons are plants of the ericaceae family, just like heathers. The story of the revolutionary Rhododendrons Inkharo begins in Germany over 20 years ago. The discovery of a rhododendron naturally growing in a chalk quarry allowed for the grafting of different varieties onto its extraordinary root system. The shrubs obtained by this method tolerate a wide range of soils with a pH ranging from 4.5 to 7.5, provided they are loose, fertile, moist, and not excessively calcareous. In summary, soil suitable for hydrangeas. The Diderk cultivar forms a large branched bush with a dense habit, reaching about 2.50 m in height at the age of 10 years with a similar spread, under good growing conditions, in open ground. Its growth is rather slow. Its large leaves are elliptical, dark green and glossy on the upper side, showing a lighter and fuzzy underside. They persist in winter. Around mid-May, for approximately 3 weeks, large clusters or spherical corymbs of several floral buds bloom at the end of the branches. They open into large flowers of 10 to 11 cm in diameter, in open corollas. The flower's centre is yellow blotched with brown and adorned with long pink stamens. The bright pink petals display a vibrant dark pink.

Rhododendron Diderk is quite hardy, down to -15°C, at least. It is relatively tolerant regarding exposure, we recommend planting it in non-scorching sun or partial shade, ideally to the east where it benefits from the morning sun while being protected from excessive heat. In the garden, with its abundant and delicate flowering, it easily decorates a shaded area of the garden, alongside Ferns, blue or variegated hostas, Pieris, heather shrubs, Kalmias, Azaleas, Japanese maples, or other rhododendrons from the same group to create superb patchworks of textures and colours. It is versatile and you can also plant it alongside many other flowering shrubs, not necessarily acid-loving: hydrangeas, mock oranges, Japanese quinces, buddleias, abelias, or autumn camellias. Japanese Anemones will also be good companions, as well as bugbanes and foxgloves, in the undergrowth.

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Plant habit

Height at maturity 2.50 m
Spread at maturity 2.50 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

Species

x hybrida

Cultivar

Inkarho Easydendron® Diderk

Family

Ericaceae

Other common names

Azalea, Rhododendron

Origin

Cultivar or hybrid

Product reference19149

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Planting and care

Plant Rhododendron Diderk in a semi-shade exposure, protected from cold and drying winds, in moist, loose, fertile soil. It will prefer slightly limestone (pH 7.5 tolerated), neutral or acidic (pH 4.5 to 6.5), soil suitable for a hydrangea. Dig a hole three times larger than the pot volume. Soak the root ball in water and plant the bush at collar level, in a nourishing mixture composed of leaf compost, gravel or pozzolan, and loam or topsoil, as Inkarho Rhododendrons are greedy plants. Water generously and keep the soil moist. Azaleas and Rhododendrons have a rather shallow root system. Therefore, they don't like long periods of drought. This is why soil enriched with humus and abundant watering during dry periods are recommended. Apply pine bark or mulch at the base of the bush every spring to keep the soil moist while maintaining a slightly acidic pH. Maintenance involves cutting off faded flowers after flowering and removing dead branches.

Azaleas and Rhododendrons can sometimes be attacked by vine weevils that eat the edges of the leaves and rootlets, as well as by the famous "Rhododendron borer" which does not often cause severe damage. There are effective natural solutions against vine weevils. Yellowing of the leaves (chlorosis) in Rhododendron indicates poor iron assimilation in the soil and can lead to premature plant death. While limestone is often the cause, poorly drained soil or deeply planted root balls can also explain the phenomenon.

 

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 Neutral, Any
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Fertile, moist and well-drained

Care

Pruning instructions If necessary, prune immediately after flowering. Pruning too late, removing the buds, would compromise the flowering of the following year.
Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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