Caryopteris clandonensis Heavenly Blue - Bluebeard
Caryopteris clandonensis Heavenly Blue - Bluebeard
Caryopteris clandonensis Heavenly Blue - Bluebeard
Caryopteris clandonensis Heavenly Blue - Bluebeard
Caryopteris clandonensis Heavenly Blue - Bluebeard
Caryopteris x clandonensis Heavenly Blue
Bluebeard, Blue Spirea, Blue Mist Shrub
Rapid development, the little flowers are very cute. Exposure to full sun well tolerated.
Alix, 25/09/2025
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Description
The Caryopteris (x) clandonensis 'Heavenly Blue' is a type of shrub that was recently developed. It is distinguishable from other types of shrubs by its vigorous growth and the vibrant blue-violet colour of its summer flowers, which form dense and fluffy-looking clusters. The plant grows upright and open, with deciduous dark greenish-grey foliage on the upper side and grey on the underside. If you crush the foliage, it smells like turpentine. This plant grows best in full sun and prefers well-drained or even dry soil. It is quite hardy and can be planted in a sunny flower bed, a large rock garden, or even in a small hedge.
The Caryopteris (x) clandonensis 'Heavenly Blue' is a hybrid plant that was created by crossing the Caryopteris incana, which is commonly known as 'Bluebeard', with the more resilient Caryopteris mongolica, found in colder regions of Mongolia and northern China. All of these plants belong to the Verbenaceae family.
The 'Heavenly Blue' plant is a dense bush that can grow up to 80 cm - 1 m in height and 70 - 80 cm in width. It blooms in August-September and produces fluffy, broad, dense inflorescences at the end of its branches. These inflorescences comprise countless small flowers with the most intense blue colour observed in caryopteris, with prominent stamens. This plant is beautiful to butterflies because of its nectar and honey, and it releases a powerful aroma with resinous notes when its small, thin, ovate leaves are crushed. The deciduous foliage is arranged opposite each other on straight stems and has irregularly dentated edges. The leaves are greyish-green, quite dark on the upper surface, while the lower surface is fuzzy and more greyish.
Caryopteris, also known as 'Heavenly Blue', is a shrub that can create low hedges. It does well in the company of other low-maintenance summer-flowering shrubs, such as yellow and orange potentillas, chamomiles, dwarf blue conifers, ceratostigma plumbaginoides, lavender, dwarf buddleias, and shrubby salvias.
In late summer, caryopteris can be paired with sunflowers, evening primroses, Epilobium canum, Aster turbinellus, or other early-blooming asters to create a colourful scene. If you group three of these shrubs and surround them with vibrant perpetual roses, the result is a stunning display of complementary colours and styles that climaxes in September.
Caryopteris clandonensis Heavenly Blue - Bluebeard in pictures
Plant habit
Flowering
Foliage
Botanical data
Caryopteris
x clandonensis
Heavenly Blue
Verbenaceae
Bluebeard, Blue Spirea, Blue Mist Shrub
Cultivar or hybrid
Planting and care
Caryopteris is a plant that requires sunny and well-drained soil to thrive. For those living in colder regions, it is best to plant the caryopteris early in autumn or spring when there is a lot of sunlight. The soil should be light and well-drained, whether rocky or sandy. However, the soil should also be relatively deep. While caryopteris can tolerate limestone, it grows more beautifully in humus-bearing soil. During winter, it is essential to avoid waterlogged soil as it can significantly affect the plant's hardiness. In well-drained soil, this plant can withstand temperatures as low as -12 to -15°C (10.4 - 5°F). To maintain a compact habit and promote the appearance of flowers on the young shoots of the year, it is recommended to prune the plant in late winter or very early spring.
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).
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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.