Buddleia 'Black Knight': Near-Black Blooms for Drama

Buddleia davidii 'Black Knight' – Darkly Alluring

'Black Knight' butterfly bush produces deep purple-blue, almost black flowers in elongated clusters on arching branches. Uncut, it reaches 10 feet; cut back, it stays half that size. Blooms from early summer to frost, with willow-like gray-green foliage.

Standout Qualities

Nearly black flowers make a dramatic statement. Highly attractive to butterflies, hummingbirds, and bees. Fast-growing and easy to cultivate, though invasive in some areas.

Cultivation

Grow in fertile, well-drained soil in full sun. Prune back or cut to ground in late winter/early spring. Deadhead regularly to encourage rebloom and reduce seeding. Propagate via semi-ripe cuttings in summer, hardwood cuttings in fall, or seed at 66–75°F in spring.

Pest & Disease Watch

Capsid bug, caterpillars, weevils, mullein moth, spider mites; fungal leaf spots and dieback possible.

Quick Facts

• Height: 6–10 ft. (uncut), 3–5 ft. (cut back)
• Spread: 10–15 ft.
• Light: Full sun
• Bloom: Summer to fall (deep purple-blue)
• Features: Fragrant, frost-tolerant, attracts pollinators