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A picture of a Buddleja 'Black Knight'

Buddleja 'Black Knight'

Buddleja davidii 'Black Knight'

Also known as

Butterfly Bush 'Black Knight', Buddleia 'Black Knight'

Buddleja davidii 'Black Knight' 2 by Ptelea (CC BY-SA 3.0)

Full Sun
Moderate care
Light watering
Frost Hardy


USDA zone


Minimum temperature

Expected size








10 years to reach maturity


  • spring
  • summer
  • autumn
  • winter

More images of Buddleja 'Black Knight'

A close up of some purple flowers on a Buddleja davidii 'Black Knight' plant
A photo of Buddleja 'Black Knight'

Buddleja 'Black Knight' Overview

Buddleja davidii 'Black Knight' is a vigorous, deciduous, bushy shrub bearing long, lance-shaped, dark green leaves with white felted undersides. In mid-summer to autumn, dense clusters of fragrant, tubular, dark purple flowers with tiny orange centres are produced on elongated, arching growth from the current year. A low maintenance, fast-growing plant that is particularly popular with butterflies, Buddleja davidii 'Black Knight' is often seen in cottage, wildlife and other informal gardens. A very tolerant plant, it prefers well-drained soil and is drought resistant. Deadhead regularly to encourage new flowers. 'Black Knight' has earned a coveted 'RHS Award of Garden Merit' and is on the RHS 'Plants for Pollinators' list highlighting plants that produce large amounts of nectar and/or pollen. A great choice for encouraging beneficial insect wildlife into your garden!

Common problems with Buddleja 'Black Knight'

How to propagate Buddleja 'Black Knight'


Propagate from semi-ripe cuttings in early summer. Root the hardwood cuttings in autumn.

Special features of Buddleja 'Black Knight'

Attractive flowers

Attracts bees

Attracts butterflies

Autumn colour

Drought resistant