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Buddleja davidii 'Black Knight'
© Deeproot Plant Base
common name: Butterfly bush
synonyms: Buddleia davidii 'Black Knight'
growth rate: fast
growth habit: arching
leaf colour: grey-green
flower colour: violet
main season: Summer
full sun, part shade
dry soil, moist soil, sandy soil
preferred soil pH: neutral-alkaline
minimum temp: -12°C
USDA zone: 6 to 9
Medium-sized deciduous shrub with long racemes of deep violet, scented flowers for a long period during the summer.
Very tolerant of poor conditions. Best in well drained soil and full sun.
Prune hard to control size, shape and encourage fresh flowering growth. Best done in early spring, but additional partial pruning can be done after flowering in autumn to prevent winter wind damage.
From semi-ripe cuttings in summer or hardwood cuttings in winter.
Attractive to butterflies.