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CARYOPTERIS x clandonensis 'Heavenly Blue'
Commonly known as Blue beard, Blue spiraea
Deepest blue
Further Reading....
- Details
- Mature Size
- Tips and Advice
- Goes Well With
- Planting Combinations
- Other Suggestions
- See Also...
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Deciduous - slightly-toothed, grey-green leaves to 5cm (2in) long.
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Blue - intense dark blue
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Height - 1m (39in)
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Spread - 1.5m (5ft)
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Medium shrub - Typically grow to around 4-6 feet in height - erect habit. Produces axillary or terminal cymes of flowers to 1cm (½in) across in late summer, early autumn
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Hardy - average winter - Hardy through most of the UK apart from inland valleys, at altitude and central/northerly locations. May suffer foliage damage and stem dieback in harsh winters in cold gardens. Plant can withstand temperatures down to -10°C (14°F)
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Full sun - in colder climates grow against warm wall.
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Additional Features - Good to know - - wildlife plant - insects, butterflies. Interestingly, many plants sold in the UK under this name may not be identical to the USA original.
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Pests & Diseases - capsid bugs.
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Place of origin - garden origin. USA. 1955. Wayside Gardens, Ohio.
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Resistant to honey fungus - These plants have little or few problems with honey fungus.
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Garden Location/Conditions - Coastal / windswept -
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Hardiness - Frost hardy (down to -5) -
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Leaf margin - Serrulate - see photos above
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Leaf shape - Lanceolate - see photos above
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Pruning group - Pruning group 4
Suitable for: Deciduous trees and shrubs that flower on current year's growth or are grown for winter stem effect.
Pruning: Hard prune to a low permanent framework.
When: Annually in early Spring.
RHS group 5, 6 & 7 -
Scented Plants - Scented foliage -
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Seasonal Interest - Autumn -
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Summer
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Soil Conditions - Medium to light, fertile, well drained soil -
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Wildlife - Bee friendly -
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Butterfly friendly
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Caryopteris - Care Guide
1m (39in)
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1.5m (5ft) |

CERATOSTIGMA willmottianum
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CARYOPTERIS x clandonensis 'Kew Blue'
Blue spiraea, Blue beard
Available from £12.50

PEROVSKIA atriplicifolia 'Blue Spire'
Russian sage
Available from £12.50

CARYOPTERIS x clandonensis 'Worcester Gold'
Blue spiraea, Blue beard
Available from £12.50
Useful extras...

Fertilisers & Feeds - Vitax
Q4 Pelleted Fertiliser
A useful fertiliser suitable for use on a wide variety of plants. Q4 provides all the nutrients and trace elements essential for vigorous growth, abundant flowering and ripening of fruit.
3 options from £6.00

Fertilisers & Feeds - Empathy
Rootgrow mycorrhizal fungi
Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
2 options from £6.00

Fertilisers & Feeds - Empathy
All-purpose Seaweed Stimulant
All-purpose organic concentrated seaweed feed that is a ready to use, derived from sustainable harvested kelp, that can be used on all outdoor and indoor plants, except acid loving plants.
Perfect used in conjunction with Rootgrow™.
Only £7.50