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Japanese Azalea Purple Splendor

Rhododendron (Azalea) x knaphill Purple Splendor
Knaphill Azalea, Hybrid Rhododendron

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Stunning azalea, with its purple hue, habitually lives up to its name: a splendour.

Feerique, 12/05/2023

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This plant carries a 24 months recovery warranty

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Value-for-money
This evergreen azalea forms a large spreading bush of 1m (3.28 ft) by 1.30m (4.26 ft) which almost disappears in May under an abundance of small flowers of a very bright magenta-violet pink that almost appear double. Perfectly hardy, it requires a semi-shaded position to flourish together with a non-chalky, well-drained but moist soil. This superb variety will be a centrepiece for an ericaceous bed or a beautiful specimen to plant in a pot on the terrace.
Flower size
5 cm
Height at maturity
1 m
Spread at maturity
1.30 m
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 October
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Description

The 'Purple Splendor' Japanese Azalea, not to be confused with 'Purple Splendour', is part of a series of hybrid rhododendrons selected in the United States for their resistance to cold. Forming a beautiful dome covered with mostly evergreen foliage, this shrub almost disappears in May under an abundance of small bright violet-pink funnel-shaped flowers, that almost look double. Plant it in the garden or in a large pot on the terrace, in semi-shade, in moist, chalk-free soil.

 

The Purple Splendor Japanese Azalea is a bush from the Ericaceae or heather family. It was developed several years ago by Joseph Gable in Pennsylvania (USA). Gable's hybrids, derived among others from Rhododendron yedoense var. poukhanense and R . Kaempferi, tolerate heat better than others and, to a certain extent, even  drought. They also have a relatively long flowering period and evergreen leaves.

'Purple Splendor' is a medium-sized cultivar, with a spreading bushy habit and relatively fast growth for an azalea. It reaches about 1 m (3.28 ft) in height and 1.30 m (4.26 ft) in width at maturity. Its long, abundant flowering period usually takes place in May. The small flowers are funnel-shaped and gathered in terminal clusters. Each, 5 cm (2 in) wide, consists of a corolla of frilly petals surrounded by a calyx of the same bright pink-violet with mauve highlights. The flower's centre is a deeper magenta pink, with long stamens of the same pink. When exposed to the sun, the flowers fade to white. The foliage, usually evergreen, consists of small, simple, oval - rounded leaves with smooth edges, arranged alternately on the branches. They are fairly dark green, with a shiny finish, taking on beautiful bronze to claret colours in cold weather. In particularly harsh winters, the foliage may be partially deciduous.

 

Japanese azaleas thrive in cool climates with distinct winters, planted in humus-rich, acidic soil, such as ericaceous soil. They are beautiful evergreen shrubs for borders or containers, attractive all year round. They are a perfect accompaniment to heathers, Japanese maples, or their relatives the Chinese Azaleas, which change their appearance throughout the seasons. They can also be combined with Japanese camellias and their graceful, often fragrant, autumn-flowered cousins, Camelia sasanqua hybrids. This Purple Splendor variety looks wonderful on the terrace or balcony, in a large, carefully chosen pot, with suitable soil, and watered with non-alkaline water.

Japanese Azalea Purple Splendor in pictures

Japanese Azalea Purple Splendor (Flowering) Flowering
Japanese Azalea Purple Splendor (Foliage) Foliage

Plant habit

Height at maturity 1 m
Spread at maturity 1.30 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour pink
Flowering time May
Inflorescence Cyme
Flower size 5 cm
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Rhododendron (Azalea)

Species

x knaphill

Cultivar

Purple Splendor

Family

Ericaceae

Other common names

Knaphill Azalea, Hybrid Rhododendron

Origin

Cultivar or hybrid

Product reference1008482

Planting and care

The Japanese Azalea likes a rather shady location unlike the Chinese Azalea, but its preferred exposure is partial shade. Plant it in ericaceous, or humus-rich, well-drained, non-calcareous soil. Take care not to plant root ball too deeply, it should be level with the surface of the soil. Water abundantly during dry periods, at least once a week during the first year, with lime-free water. In spring, apply fertilizer for ericaceous plants. Pruning is not essential but it is a good idea to prune lightly after flowering to keep the plant looking neat. Remove spent flowers to encourage new growth. The Azalea has few diseases when well established outdoors. It can be attacked by weevils that eat the edge of the leaves and the rootlets, as well as by the famous "rhododendron lace bug" which do not often cause serious damage. If the soil is chalky or poorly drained, and if the plant is planted too deep, the leaves may turn yellow and eventually die.

Planting period

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

Intended location

Suitable for Woodland edge
Type of use Border, Edge of 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-rich, well-drained

Care

Pruning instructions Pruning is optional. After flowering, remove dead wood and if you need to limit the branches, do so sparingly, as severe pruning could compromise future flowering.
Pruning Pruning recommended once a year
Pruning time July to August
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground
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