Stately spires of semi-double, deep purple flowers, opening in June and July on tall stems. These dark-eyed delphiniums look fantastic planted in bold clumps as part of a cottage-garden scheme or towards the back of a well-drained, sunny border, where they will add height and bold splashes of colour. They also make excellent cut flowers.

The double, deep blue petals transition to purple, terminating in a dark, unfathomable centre, making Delphinium 'Black Knight Group' a showcase summer plant with plenty of vertical and architectural interest and providing excellent cut flowers.