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Rhododendron Pink Spider - Japanese Azalea

Rhododendron (Azalea) obtusum Pink Spider
Japanese Azalea, Kurume Azalea

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This Azalea is easily recognisable by its unique, semi-double flowers, with long, tapered pink petals edged in white which resemble large, brightly coloured spiders. Forming a compact bush, which can even be grown in a pot, this variety is adorned with beautiful, shiny dark green evergreen foliage, on which the spring flowering stands out well. Whether in a pot or in the ground, Pink Spider can be grown in non-limestone, humus-rich, moist but well-draining soil, in light shade.
Flower size
8 cm
Height at maturity
70 cm
Spread at maturity
80 cm
Exposure
Partial shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time March to May, September to November
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Description

Rhododendron Pink Spider is a hybrid Azalea which renews the genre with its original flowering, very different from the usual varieties. Not only are the flowers bicolour, pink in the centre and edged with white, but their shape is truly unprecedented. They resemble big spiders covering the dark foliage, as the elongated petals are like narrow legs. This variety stays compact, perfect in a border or planted in a container to enhance a terrace or balcony. It appreciates partial shade, grows in acidic, moist, humus-bearing soil and shows good hardiness.

Azaleas are in fact Rhododendrons from a botanical point of view, they are plants from the large family of ericaceae, rich in about a hundred genera. The Rhodos, as they are affectionately called by nurserymen and horticulturists, constitute an important group, which they have therefore classified into different categories, including the Japanese Azaleas to which Pink Spider belongs. This horticultural variety, probably of Dutch origin, appeared on the market in the early 2000s.
Even today, it surprises with its decidedly atypical and particularly decorative flowering. Grouped in cymes at the end of the branches, the flowers appear around mid-May and bloom for about 3 weeks. They are semi-double and produce narrow and elongated petals, well spread out on the periphery and sometimes taking on a slightly crumpled appearance in the centre. They have a deep pink centre, edged with white on their periphery, which visually refines them even more. This "spider legs" morphology must have inspired the hybridizer to name the variety Pink Spider. The abundant, eye-catching flowering covers a good part of the foliage with rather large (8 to 10 cm in diameter) blooms.
The oblong to lanceolate, dark green leaves, measure about 5-6 cm long by 2 cm wide. They are evergreen so ornamental all year round with their glossy texture. Their dark colour is a true setting for the bright flowers in late spring.
This hybrid Rhododendron shows moderate growth, reaching a height of approximately 70 cm and a slightly larger spread after 10 years. These dimensions make it easy to cultivate in a decorative container to enhance a balcony or terrace. Azaleas and rhododendrons develop a shallow root system, to which moisture should always be available. However, these roots don't like stagnant moisture that suffocates them. In the ground, choose a moist and slightly shaded location without excess water in winter. An acidic (pH 4.5 to 6) and humus-bearing soil is perfect. Quite hardy, down to -15°C, or even -18°C, this Azalea hates atmospheric and soil dryness and will therefore grow better in an oceanic climate than a Mediterranean one.

The Pink Spider Japanese Azalea will delight enthusiasts of original blooms. Perfect in a semi-shaded border, you can plant the whole range of acid soil plants alongside it. To create vegetation layers and thus create a stylish scene, plant Andromeda polifolia Blue Ice at its feet, a dwarf bush with foliage as fine as rosemary, but with a silvery-blue hue, and delicate pink flowers throughout spring. Just behind the Azalea, a Mountain Laurel (Kalmia latifolia) will support it with its curious pale pink flowering. The astonishing flowers with fused petals open in a cup shape and are grouped in large and very decorative clusters. In the background, a beautiful Magnolia such as Manchu Fan with its abundant white flowering will complete this spring scene beautifully.

Plant habit

Height at maturity 70 cm
Spread at maturity 80 cm
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour two-tone
Flowering time May
Inflorescence Cyme
Flower size 8 cm

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron (Azalea)

Species

obtusum

Cultivar

Pink Spider

Family

Ericaceae

Other common names

Japanese Azalea, Kurume Azalea

Origin

Cultivar or hybrid

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Planting and care

The Pink Spider Japanese Azalea appreciates partial shade and coolness. Plant it in peaty, humus-rich, well-drained soil, but above all non-alkaline. Soak the root ball in a bucket for fifteen minutes before planting. Choose a location in partial shade, sheltered from the strong afternoon sun. When planting, make sure not to bury the root ball too deep, it should be at ground level. Water abundantly during dry periods, at least once a week during the first year, with non-alkaline water. In spring, apply fertiliser for acid-loving plants. After the first flowering, you can prune lightly to maintain a tidy plant, but pruning is not essential. Remove faded flowers to promote the emergence of new shoots. The Azalea has few diseases when well-established outdoors. It can be attacked by weevils that eat the edges of the leaves and rootlets, as well as by the famous "rhododendron beetle" which rarely causes significant damage. If the soil is chalky or poorly drained, and if the plant is planted too deep, the leaves may turn yellow and the plant will eventually perish.

Planting period

Best planting time March, October
Recommended planting time March to May, September to November

Intended location

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

Care

Pruning instructions Pruning is optional. After the first flowering, remove dead wood and if you need to reduce the branches, do so sparingly, as severe pruning could compromise future flowerings.
Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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