Buddleja davidii 'Black Knight'
Stunning midnight garden colour
Grown by Mike's trusted specialists
Europe
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Plant diary
- Flower
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Buddleja davidii 'Black Knight'
- A remarkable addition to any collection, Buddleja davidii 'Black Knight' is defined by its long, magnificent spikes of deep purple, honey-scented flowers. This phenomenal feature transforms any well-planned garden scheme.
- It provides a brilliant structural foundation with its vigorous, fast-growing, and gracefully arching growth habit. It is beautifully complemented by its silvery-green, lance-shaped deciduous leaves highlighting the vibrant blooms, making it highly rewarding to cultivate.
- You can expect rapid, healthy establishment in full sun and well-drained soil, responding incredibly well to a hard spring prune. It is a wonderfully dependable choice for both novice and experienced gardeners.
- Adding wonderful movement to the garden, Buddleja davidii 'Black Knight' invites butterflies, earning it the famous moniker of 'The Butterfly Bush' all year round. The intense colouration makes it a dramatic focal point in any summer border.
- From a historical perspective, buddleja was named after the Reverend Adam Buddle, an amateur English botanist. Introduced from China in the 1890s, it quickly became a cottage garden staple.
What to expect
Supplied as
Eventual height
Eventual spread
Flower colour
Habit
Hardiness
Spacing
Will this grow in my garden?
Can I grow this in a pot?
Yes, the Buddleja davidii 'Black Knight' can be grown in a pot, provided it has adequate drainage and a container at least 40 cm wide.
How big does it get?
The Buddleja davidii 'Black Knight' typically reaches a mature height of 1.5 to 2.5 metres and a spread of 1.5 to 2.5 metres.
How much sunlight does this need?
The Buddleja davidii 'Black Knight' requires full sun to produce the most abundant and vibrant blooms.
What kind of soil does this plant prefer?
The Buddleja davidii 'Black Knight' prefers a light, well-drained soil and can struggle in heavy, waterlogged clay.
How much watering does this plant need?
The Buddleja davidii 'Black Knight' needs deep watering of about 25 to 50 millimetres per week during its establishment phase, after which it becomes more drought-tolerant.
Will this plant need pruning?
Yes, the Buddleja davidii 'Black Knight' needs regular pruning, typically cut back to around 30 cm from the ground in early spring, to encourage healthy new growth and optimal flowering.
How hardy is this plant?
Buddleja davidii 'Black Knight' is fully hardy with an RHS rating of H6, meaning it tolerates temperatures down to -20°C and is completely hardy throughout the UK.
The wider garden
Europe
Meet Mike's trusted specialists
Start with a touch of continental sun
Over 99% of our plants are grown in the UK, but where that’s not possible, Mike sources the best specialist growers in Europe for the job. Think citrus warmed by Sicilian sun, topiary trained by Dutch masters, almonds nourished in the Dordogne and bamboo bathed in Tuscan heat. Our handpicked growers nurture these plants to maturity before handing over to our team in the Cotswolds, to toughen them up for UK gardens.
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