£5.83 – £8.19Price range: £5.83 through £8.19
Buddleja davidii ‘Black Knight’ is a captivating Butterfly Bush, renowned for its striking deep purple flowers and ability to attract butterflies and bees. This vigorous, deciduous shrub provides a long-lasting floral display from summer to autumn, making it a vibrant addition to any UK garden.
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Discover Buddleja davidii ‘Black Knight’, a stunning butterfly bush delivering deep purple blooms and creating a vibrant focal point in UK gardens.
Known widely as the Butterfly Bush, Buddleja davidii ‘Black Knight’ brings captivating beauty to any outdoor space. This vigorous shrub, originating from China and Japan, is especially cherished for its ability to draw a multitude of beneficial insects.
Its elegant form and rich colour enhance garden borders and wildlife-friendly planting schemes alike. Gardeners often select this plant for its easy-going nature and long-lasting floral display, making it a truly rewarding addition. Consequently, it has become a firm favourite across the United Kingdom.
This particular cultivar offers several compelling attributes for the discerning gardener. Indeed, its appeal extends beyond its visual charm.
The genus name ‘Buddleja’ honours Adam Buddle, an English botanist. Furthermore, the species epithet ‘davidii’ commemorates Father Armand David, the French missionary who first documented the plant in China. The cultivar ‘Black Knight’ refers to its exceptionally deep, almost black-purple flower spikes. These impressive panicles can reach up to 30cm in length. Their rich colour provides a dramatic contrast against the plant’s lance-shaped, grey-green foliage. The leaves themselves are typically woolly on their undersides. This deciduous shrub sheds its leaves in late autumn. However, it reliably produces fresh, vibrant growth each spring.
This magnificent plant serves many purposes within a garden design. Firstly, it excels as a standalone specimen. It also blends beautifully into mixed shrub borders. Consequently, it helps define garden boundaries with its substantial size. Many gardeners strategically place Buddleja davidii ‘Black Knight’ near seating areas. This allows for closer observation of the numerous butterflies it attracts. Its open structure furthermore provides shelter for smaller garden creatures.
Given its vigorous growth, pruning is a common practice. Gardeners typically prune this butterfly bush hard in early to mid-spring. This encourages a more compact shape and promotes an abundance of new, flower-laden shoots. Therefore, regular pruning is key to maintaining its best display. Overall, this plant is an invaluable asset for creating vibrant, wildlife-rich UK gardens.
Very hardy. Tolerates temperatures typical of a continental winter.
Buddleja davidii 'Black Knight' thrives in full sun and well-drained soil. Water regularly during dry spells, especially in its first year. Prune hard in early to mid-spring (March-April) by cutting back old stems to a low framework of 30-60cm to encourage vigorous new growth and abundant flowering. Deadhead spent flowers to prolong the blooming period and prevent self-seeding.
This plant is deciduous so it will lose all of its leaves in the autumn and get fresh new foliage each spring.


