Origin
Buddleja davidii 'Black Knight' is a cultivar of butterfly bush, originating from China. This species was introduced to Europe in the 19th century. The 'Black Knight' cultivar was selected for its striking flower colour. The plant belongs to the family Scrophulariaceae.

Characteristics
Buddleja davidii 'Black Knight' is a deciduous shrub that can reach a height of 2 to 3 metres. It has narrow, lance-shaped, grey-green leaves. The flowers form dense, elongated panicles and are a deep purple, almost black in colour. Flowering occurs from July to September. The flowers are strongly and pleasantly scented.

Care
Buddleja davidii 'Black Knight' grows best in a sunny position. The plant tolerates various soil types, provided they are well-drained. Pruning back annually in early spring encourages a compact growth habit and abundant flowering. The shrub is hardy. Regular removal of spent flowers stimulates the formation of new blooms.