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Buddleja davidii Sugar Plum - Butterfly Bush

Buddleja x davidii Sugar Plum
Butterfly Bush, Summer Lilac

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A recent variety with many qualities! Its habit is more compact than that of the species and forms a small, bushy, and densely branched shrub. From summer to autumn, it produces distinctive reddish-purple flowers, which contrast beautifully with its silvery grey-green foliage. It can be grown in a pot on a terrace, in the middle of a flower bed or as part of a hedge. Hardy and undemanding, it will easily liven up your outdoor spaces!
Flower size
25 cm
Height at maturity
1.50 m
Spread at maturity
1 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, September to October
Recommended planting time February to May, September to December
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Flowering time July to October
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Description

Buddleja davidii 'Sugar Plum', also known as Buddleja Sugar Plum ('Lonplum'), is a recent hybrid with many qualities! Its habit is more compact than the typical variety and forms a small, dense bush. From summer to autumn, it projects flower spikes in all directions. Its flowers are a deep purple-red and contrast remarkably well with its silvery grey-green foliage. It can be grown in a pot on a terrace, in the ground in a border, or as part of a hedge. Hardy and undemanding, this butterfly bush will easily bring life to your outdoor spaces!

 

The buddleja genus includes around a hundred species of deciduous or evergreen shrubs, native to China, Africa, South Asia, and South America. They are named after Adam Buddle, a famous English botanist from the 17th century. This genus is sometimes spelled 'Buddleia', but the official spelling appears to be 'Buddleja'. Most buddlejas are shrubs with a flexible and irregular habit, giving them a very natural appearance.

'Sugar Plum' is a result of a cross between Buddleja davidii 'Royal Red' and B. davidii 'Summer Beauty', and it combines the main qualities of these two varieties: very vibrant purple flowers and a compact and dense habit. This small-growing shrub reaches a height of 1.5 to 2.5 m (5 to 8 ft) with a spread of 1 to 1.5 m (3 to 5 ft). It forms a generous, well-branched bush with a fairly orderly silhouette for a buddleja. Its arching branches bear deciduous, silvery grey-green foliage. Its long leaves measure over 10 cm (4 in), are simple, lanceolate, opposite, and have slightly toothed margins. From mid-summer to autumn, Buddleja davidii 'Sugar Plum' is covered in flower spikes that project in all directions, above its still visible foliage, creating a striking contrast of colours. This flowering consists of small tubular flowers in shades of pink-red with a yellow throat, arranged in long conical panicles at the end of the branches. The racemes are very dense and can measure up to 30 cm (12 in) long. The flowers release a light sweet fragrance that attracts bees and butterflies. The flowering is followed by fruiting in the form of small round capsules containing numerous seeds that birds help to disperse. Some buddleja species are considered invasive due to their abundant self-seeding. However, it should be noted that these shrubs generally colonise areas heavily impacted by human activity, particularly urban areas. Buddleja davidii, or David's butterfly bush, is one of these invasive species that should be controlled to prevent its spread.

 

Gardeners appreciate the long summer flowering of buddlejas and use them in hedgerows, borders, and as standalone plants when their size allows. Thanks to its modest size and compact habit, Buddleja davidii 'Sugar Plum' can easily be grown in a container. It decorates terraces and balconies for long months with its striking foliage and radiant flowering. This dwarf buddleja can also be planted individually in a small garden without fear of going unnoticed! You can also use it in a flower bed or hedge, combined with a 'Red Heart' hibiscus for the contrast of its white flowers, Pseudowintera 'Mount Congreve' for its dense and decorative foliage, or a 'Falconnet Charlet' flowering quince for its dark pink spring blossoms.

Buddleja davidii Sugar Plum - Butterfly Bush in pictures

Buddleja davidii Sugar Plum - Butterfly Bush (Flowering) Flowering

Plant habit

Height at maturity 1.50 m
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate fast
Suckering/invasive plant

Flowering

Flower colour red
Flowering time July to October
Inflorescence Panicle
Flower size 25 cm
Fragrance slightly scented, sweet and floral fragrance
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms
Flowering description Small tubular flowers grouped in long conical panicles at the tips of arching branches.

Foliage

Foliage persistence Deciduous
Foliage colour green
Foliage description Long single lanceolate leaves.

Botanical data

Genus

Buddleja

Species

x davidii

Cultivar

Sugar Plum

Family

Buddlejaceae

Other common names

Butterfly Bush, Summer Lilac

Origin

Cultivar or hybrid

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Planting and care

In its country of origin, China, Buddleja davidii grows in mountainous areas, within shrubby thickets. It is highly resistant to pollution and also establishes itself along highways or railways. It is a hardy bush that can withstand temperatures below -20°C (-4°F). It thrives in very sunny or slightly shaded locations, sheltered from strong winds, and tolerates all types of soil, even poor and chalky ones.

Plant your 'Sugar Plum' butterfly bush in deep, well-drained, slightly enriched soil. Note that excessively rich soil will promote vegetative growth at the expense of flowering. Protect it from excessive moisture in winter. However, it will easily tolerate short periods of drought once it is well established.

At the end of winter, ideally in March, prune your buddleja severely. This will help maintain the vigour of the bush and promote generous flowering. Easy to cultivate and resistant to diseases, Buddleja davidii 'Sugar Plum' will reveal its beauty without difficulties!

 

Planting period

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

Intended location

Suitable for Meadow, Rockery, Woodland edge
Type of use Border, Free-standing, Container, Hedge, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Deep, moist and well-drained soil.

Care

Pruning instructions The bush only requires a single pruning after flowering, or in spring. However, every 2 to 3 years, cut back the branches to maintain a compact habit and thus prevent the bush from "opening up". In late winter, around March or April, remove half or even two-thirds of the branches and cut off all the dead wood. Buddlejas flower on the current year's wood, so you won't risk removing the upcoming flowers.
Pruning Pruning recommended once a year
Pruning time March to April, October
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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