This grower is sure of this plant identification.
Also have a Buddleja 'White Proffusion' for sale. £4
Buddleja davidii ‘Black Knight’ (Butterfly bush). A vigorous, deciduous, arching shrub bearing long, lance-shaped, dark green leaves and white felted undersides. In mid-summer to autumn, dense clusters of fragrant, tubular, dark red-purple flowers are produced.
They are fully to half hardy, and will require full sun with fertile well drained soil. Suitable for a mixed or shrub border, they are generally easy to grow. Prune hard in winter to control shape.
Italics = data drawn from parent genus or speciesView Full Plant Finder Record