Buddleia davidii ' Black Knight'
Common Name: Butterfly Bush, Summer Lilac
Zones 5 to 10;
Mature size 8 to 10 feet height, spreads 5 to 10 feet.
A classic buddleia. This variety has long been treasured for its showy panicles of very dark violet to dark purple flowers which appear over a long period from late summer into fall. The long, gray-green leaves and tall, upright stems form a large shrub which can grow up to 10' tall. 'Black Knight' has proven to be a vigorous grower and a very hardy selection.