Butterfly bush

Buddleia davidii 'Black Knight'

Photo/Illustration: 
Steve Aitken
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Butterfly bush (Buddleia davidii 'Black Knight')
BUD-lee-ah dah-VID-ee-eye
Genus:  Buddleia
Butterfly bushes are carefree deciduous shrubs that are reliably fragrant and easy to grow. Butterflies swarm to their blooms all summer long. 'Black Knight' has deep purple-blue, almost black, flowers in elongated clusters on arching branches to 10 feet tall if not cut back, and half that size if cut back. The blooms come from early summer to first frost. The foliage is willow-like and grayish green.
Noteworthy Characteristics:  Nearly black flowers. Attractive to butterflies, hummingbirds, and bees. Easy to grow, but is in invasive in some areas. Fast grower.
Care:  Easy to grow in fertile, well-drained soil in full sun. Prune back or cut to the ground in late winter or early spring. Deadhead regularly.
Propagation:  Root semi-ripe cuttings in summer or hardwood cuttings in fall. Sow seed at 66-75°F  in spring.
Problems:  Capsid bug, caterpillars, weevils, mullein moth, spider mites. Fungal leaf spots and diebacks can occur.

Overview

Height
6 ft. to 10 ft.
Spread
10 ft. to 15 ft.
Growth Habit
Clumps
Growth Pace
Fast Grower,
Invasive/Aggressive Grower
Light
Full Sun Only
Moisture
Medium Moisture
Maintenance
Moderate
Characteristics
Attracts Butterflies,
Attracts Hummingbirds,
Fragrant Flowers,
Showy Flowers
Bloom Time
Fall,
Summer
Flower Color
Blue Flower,
Purple/Lavender Flower
Uses
Beds and Borders,
Cut Flower
Style
Cottage Garden
Seasonal Interest
Summer Interest
Tolerance
Frost Tolerant
Type
Shrubs

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Butterfly bush
Buddleia davidii