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Home Page » Home & Garden » Gardening » Butterfly bush: Buddleia davidii Black Knight

Butterfly bush: Buddleia davidii Black Knight

Other common names: summer lilac

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Butterfly bush: Buddleia davidii Black Knight

Butterfly bushes are long-blooming, 5- to 8-foot-tall shrubs with arching branches. 'Black Knight’ is a vigorous butterfly bush whose long, dark-purple flower spikes contrast with its gray-green leaves. Its fragrant flowers bloom throughout the growing season.

Profile

Plant typeshrub
Hardiness zones5 to 9
Lightfull-sun
Height4 ft. to 5 ft.
Spread4 ft. to 5 ft.
Soil pHslightly-acidic-to-neutral-pH6.5-7
Soil moistureaverage
Bloom timefall,summer
Flower colorpurple
Bloom size6 in. to 6 in.
Foliage colorgray-green
Foliage size10 in. to 10 in.

did you know?

The butterfly bush is so named because its nectar-rich flowers, especially those of the pink- and red-flowering cultivars, are practically irresistible to butterflies.

general maintenance:

Deadhead spent flowers. In northern regions, where tip dieback may occur, or to maintain a neat habit and encourage heavy flowering in any region, prune the entire plant to 8?12 inches from the ground in spring before the buds begin to swell.

pests/diseases:

Butterfly bush is relatively carefree.

how to sow/plant:

Choose a sunny site with well-drained soil, and amend with compost or well-rotted manure. Plant in early spring as a specimen or in a shrub border, 4?6 feet apart. Set plants at the same depth they were in pots. Water after planting, and mulch to conserve moisture.

water and fertilize:

Monitor soil moisture all season. Feed in spring, especially those cut back hard (see General Maintenance), with a 20-20-20 fertilizer, following label directions.

garden hint:

At the end of the season, reduce amount of deadheading and allow some flower spikes to dry on the plant. The dried flowers will persist on the bare branches through most of the dormant season, adding interest to the winter landscape.

features:

  • Attractive Flowers
  • Attractive Foliage
  • Attractive Fruit
  • Attracts Butterflies
  • Deciduous
  • Drought Tolerant
  • Fragrant

garden uses:

  • Edging
  • Flowerbed borders

other uses:

  • Cut Flower

combine with:

'Preziosa,' 'Samobor,' and 'David.'

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