previous
  • Using Containers as Elements of a Design
    Using Containers as Elements of a Design
  • Homegrown / Homemade
    Homegrown / Homemade
  • Seed Starting in Speedling Trays
    Seed Starting in Speedling Trays
  • Plant Finder: Spring Plants
    Plant Finder: Spring Plants
  • 3 Ways to Design with Containers
    3 Ways to Design with Containers
  • Go Green on the Patio
    Go Green on the Patio
  • DIY A-Frame Veggie Trellis
    DIY A-Frame Veggie Trellis
  • Get your FREE Everyday Roses download now!
    Get your FREE Everyday Roses download now!
  • Pick Plants for Fragrance
    Pick Plants for Fragrance
  • Garden Design Basics
    Garden Design Basics
  • NEW Video Series: There's a Better Way
    NEW Video Series: There's a Better Way
  • Pantone Color of the Year 2014: Radiant Orchid
    Pantone Color of the Year 2014: Radiant Orchid
  • Black Plants Done Right
    Black Plants Done Right
  • Building Better Borders
    Building Better Borders
  • 10 Combinations for Shade
    10 Combinations for Shade
  • Bold and Beautiful Zinnias
    Bold and Beautiful Zinnias
  • How to Grow Mustard
    How to Grow Mustard
  • 20 Gardenworthy Self-Sowers
    20 Gardenworthy Self-Sowers
  • Rex Begonias
    Rex Begonias
  • 10 Seed-Starting Tips
    10 Seed-Starting Tips
  • Planting the Right Way
    Planting the Right Way
  • Indoor Seed Starting Materials List
    Indoor Seed Starting Materials List
next

Buddleia davidii 'Black Knight' (Butterfly bush, Summer lilac)

Buddleia davidii 'Black Knight' Photo/Illustration: Steve Aitken


Be the first to rate this plant

Plant Showcase - from our advertisers


Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11
Botanical Name: Buddleia davidii 'Black Knight' BUD-lee-ah dah-VID-ee-eye Common Name: Butterfly bush, Summer lilac 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.
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
Tolerance Frost Tolerant
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, Fall Interest
Type Shrubs

Plants you might also like

Buddleia 'Lochinch' Buddleia 'Lochinch'
(Butterfly bush, Summer lilac)
Be the first to rate this plant
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

Butterfly bushes are carefree deciduous shrubs that are reliably fragrant and easy to grow. Butterflies swarm to their blooms all summer long. 'Lochinch' has extremely fragrant lilac-blue flowers with orange eyes. It is a cross between B. davidii and B. fallowiana. Its arching, mounded habit typically reaches 3 to 5 feet in one season, but can grow much taller in the deep South. The 8-  to 12-inch-long flower spikes begin in late summer and bloom until frost, starting a little later than the B. davidii cultivars.

Rosa 'Buff Beauty' Rosa 'Buff Beauty'
(Hybrid musk rose)
Be the first to rate this plant
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This fragrant rose produces generous clusters of double apricot flowers that fade to a soft yellow. It usually grows to 5 feet and taller when trained, making it an ideal candidate for screening or growing up a wall, arch, or trellis. It blooms from spring to autumn. 

Rosa 'Crepuscule' Rosa 'Crepuscule'
(Noisette rose)
Be the first to rate this plant
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This climber produces an endless display of fragrant apricot-yellow blossoms. It grows to about 12 feet high and makes the perfect vertical accent in the garden.

Rosa 'Blanc Double de Coubert' Rosa 'Blanc Double de Coubert'
(Hedgehog rose, Ramanas rose, Japanese rose, Sea tomato)
(1 user review)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

The white of this rose has a purity of color that is without equal. It produces semi-double, very fragrant flowers from spring to fall, which are sometimes followed by orange hips. It grows to 6 feet high and wide.   

Rosa 'Betty Prior' Rosa 'Betty Prior'
(Floribunda rose)
(1 user review)
Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11

This rose produces single, carmine-pink, slightly fragrant blooms nonstop from June until frost. It grows 2.5 to 5 feet high and wide.