Japanese Azalea Purple Splendor
Japanese Azalea Purple Splendor
Japanese Azalea Purple Splendor
Japanese Azalea Purple Splendor
Rhododendron (Azalea) x knaphill Purple Splendor
Knaphill Azalea, Hybrid Rhododendron
Unfortunately, it withered 3 weeks after planting... And I even transplanted it shortly after receiving it.
TRZ, 05/02/2025
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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
Plant habit
Flowering
Foliage
Botanical data
Rhododendron (Azalea)
x knaphill
Purple Splendor
Ericaceae
Knaphill Azalea, Hybrid Rhododendron
Cultivar or hybrid
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
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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