The Black Knight Butterfly Bush (Buddleja 'Black Knight') is a deciduous shrub known for its striking, dark purple to burgundy flower spikes that bloom from summer through fall. It typically reaches a height of 6 to 8 feet and spreads about 4 to 6 feet wide, making it suitable for both large gardens and commercial landscapes. The plant features lance-shaped, green foliage that provides a sturdy backdrop to its colorful blooms. Black Knight Butterfly Bush thrives in full sun and well-drained soil, and it is relatively low maintenance, requiring regular pruning to maintain its shape and encourage healthy growth. It is also known for attracting butterflies and other pollinators, making it a beneficial addition to environments aimed at supporting local wildlife.