Buddleja davidii 'Black Knight'

Common name: butterfly bush

Description: An RHS Award of Garden Merit shrub with arching, grey-green leaves, silvery beneath, and long, honey-scented panicles of deep violet-purple flowers, almost black in bud, from midsummer into autumn.

Other benefits: RHS Award of Garden Merit winner, exceptionally deep flower colour, irresistible to butterflies and bees

Wildlife attraction: bees, butterflies

Height & spread (approx.) at 10 years: 3m x 3m

Position: full sun or partial shade

Soil pH: neutral to alkaline

Moisture: moist but well-drained or well-drained

Winter hardiness: hardy to around -15°C