Dense mound-forming shrub with aromatic dull dark-green leaves silvery beneath. Intense dark blue flowers produced in clusters. Height 1m. Spread 1.5m. Flowers August to September. Full Sun. Hardy.
Caryopteris × clandonensis ‘Heavenly Blue’ is a compact, mound-forming deciduous shrub prized for its aromatic foliage and striking clusters of deep blue flowers that provide vibrant late-season colour in borders and wildlife-friendly gardens.
PLANTING and AFTERCARE GUIDE
Best Planting Time
Spring: Plant Caryopteris × clandonensis ‘Heavenly Blue’ in spring when the soil is workable and beginning to warm, allowing roots to establish before active growth.
Early Autumn: Early autumn is also an excellent time to plant, giving the root system an opportunity to settle before dormancy.
Site Selection
Sunlight: Caryopteris × clandonensis ‘Heavenly Blue’ thrives in full sun, where it will produce the best foliage colour and the most abundant flowers.
Soil: Well-drained soil is essential. Improve heavier soils with grit or organic matter to enhance drainage and encourage healthy root development.
Planting Instructions
Prepare the Hole: Dig a hole twice the width and the same depth as the root ball to allow the roots to spread freely.
Soil Preparation: Mix compost or well-rotted organic matter into the excavated soil to improve structure while maintaining good drainage.
Planting: Position Caryopteris × clandonensis ‘Heavenly Blue’ so the top of the root ball sits level with the surrounding soil, then backfill gently and firm the soil around the base.
Watering After Planting: Water thoroughly after planting to settle the soil and encourage strong root establishment.
Watering Requirements
Growing Season: Water regularly during the first growing season to help establish a healthy root system, allowing the soil surface to dry slightly between waterings.
Established Plants: Once established, Caryopteris × clandonensis ‘Heavenly Blue’ is drought tolerant and generally only requires additional watering during prolonged dry periods.
Feeding
Spring: Apply a balanced fertiliser in early spring to promote healthy foliage and vigorous flowering.
Mid-Season: An optional light feed during summer can help Caryopteris × clandonensis ‘Heavenly Blue’ maintain strong growth and an extended flowering display.
Pruning
Annual Pruning: Cut stems back hard in early spring to encourage fresh growth, as flowers are produced on new wood.
Seasonal Care: Remove any dead, damaged, or weak stems to maintain a neat, compact shape.
Mulching
Spring: Apply a layer of organic mulch around the base to retain moisture, suppress weeds, and improve soil quality.
Later in the Year: Refresh the mulch when required, ensuring it remains clear of the main stem to promote good air circulation.
Supporting the Plant
Natural Habit: Caryopteris × clandonensis ‘Heavenly Blue’ naturally forms a sturdy, rounded shrub and rarely requires staking, even when in full flower.
Final Tips
Caryopteris × clandonensis ‘Heavenly Blue’ is an easy-care shrub that delivers outstanding late-season colour while attracting pollinators to the garden. With a sunny position, free-draining soil, and annual pruning, your Caryopteris will thrive and provide reliable displays for many years.
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